Iowa Permit Practice Test — Written Test, Free to Start

Free 10-question Iowa permit practice test, then 40-question practice tests, each question cited to the Iowa Driver's License Manual.

The exam

This practice test is 40 questions, and 32 correct is a pass. Everything on it comes out of Iowa Driver's License Manual. Officially it is the knowledge test; most people call it the written test, or the permit test.

Iowa does not publish how many questions its knowledge test asks, or the score that passes it. This practice test asks 40 and passes at 32.

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

Ask a question about Iowa road law

Easier than searching the manual: ask in your own words — how far from a fire hydrant you may park, when you must stop for a school bus — and the answer comes from Iowa Driver's License Manual or Iowa’s code, with the page or the section it is in. When neither says, the answer says so rather than guess. Or tick Nationwide and compare every state on one question.

Ask a question

Iowa driving law, answered

Iowa driving questions, answered

What it costs

  • One payment, once — not a subscription. Nothing renews and there is nothing to cancel, for an exam you sit one time.
  • Free to start: a 10-question test and the first section of cards. No sign-up and no account.
  • Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
  • Every level up to Prepared — 3 tests passed in a row.
  • Do the work, fail the real exam, and we refund you.

What Iowa tests

155 concepts, 536 separate rules. Each one is a page of its own.

Questions from the Iowa test

Who must have a permit or license to drive on Iowa public roads?

Anyone driving a car, motorcycle, or moped. A moped is small, but it still shares the road with cars, so its rider has to show they know the rules. Iowa Driver's License Manual, p.4: “In Iowa, anyone operating a motor vehicle, motorcycle, or moped on public roads is required to have a permit or license.”

How long must you live in Iowa without a break to count as a resident for licensing?

30 days. Once you have made Iowa your home for a month, you are expected to get an Iowa license. Iowa Driver's License Manual, p.4: “Lived in Iowa continuously for 30 days.”

How far from the home farm may farm equipment be driven without a driver's license?

2 miles. Short farm trips between nearby fields are allowed without a license, but only close to the home farm. Iowa Driver's License Manual, p.4: “Driving farm equipment between the home farm and any nearby farmland or farm operation within two miles.”

When should your license or permit be with you?

Every time you get behind the wheel. If you are stopped, the officer needs to see right away that you are allowed to drive. Iowa Driver's License Manual, p.5: “You should always have your license or permit with you while driving.”

Which screening must you complete when you apply for an Iowa license?

A vision screening. You cannot avoid what you cannot see, so your eyes are checked before you get a license. Iowa Driver's License Manual, p.5: “When you apply for your license, you will be required to do the following:”

What does red on a traffic sign tell you?

Stop, yield, or do what the sign shows. Red is saved for signs you must obey right now, so it catches your eye first. Iowa Driver's License Manual, p.6: “Stop, yield, or do what is shown on the sign.”

Which sign is the only one that uses the eight-sided shape?

The stop sign. Because no other sign uses this shape, you can know it is a stop sign even if snow covers the word. Iowa Driver's License Manual, p.7: “Shape is reserved for a stop sign only.”

What does this sign warn you about?

A zone where you may not pass. Passing here would put you in the path of cars you cannot yet see, so stay in your lane. Iowa Driver's License Manual, p.7: “It warns you of a no passing zone.”

What does a red circle with a red slash over a symbol mean?

You cannot do what the symbol shows. The slash crosses out the action, so whatever is under it is not allowed here. Iowa Driver's License Manual, p.8: “Some regulatory signs have a red circle with a red slash over a symbol.”

What two things does the ENS sign at a railroad crossing give you?

A railroad phone number and a crossing ID. The number and ID tell the railroad exactly which crossing has a problem, so they can stop trains in time. Iowa Driver's License Manual, p.8: “It includes a phone number to contact the railroad and a unique crossing identification number.”

What does this sign tell you?

The fastest speed allowed in ideal conditions. The posted limit is the fastest you may go on a good day, not the speed you must drive in bad weather. Iowa Driver's License Manual, p.8: “Speed limit signs indicate the maximum or minimum safe speed that is allowed.”

What does this sign warn you about?

A road ahead crosses yours. Cars from the side road may pull out in front of you, so watch both ways as you near it. Iowa Driver's License Manual, p.9: “There is another road ahead that crosses the road you are on.”

You see a farm machinery warning sign. What should you do?

Reduce your speed and pass slowly. You close in on a slow tractor or buggy very fast, and passing fast can scare a horse or clip a wide machine. Iowa Driver's License Manual, p.9: “Be alert for slow-moving, farm equipment on the roadways.”

A person in a wheelchair is crossing at a crosswalk in front of you. What must you do?

Yield the right of way to them. A person on a skateboard or in a wheelchair is just as easy to hurt as a person walking. Iowa Driver's License Manual, p.10: “The new law states that vehicles must yield the right of way to pedestrians on foot and those using any human powered device, also known as a pedestrian conveyance.”

A vehicle with a slow-moving vehicle sign is traveling at what speed?

35 mph or less. You can come up on a slow vehicle very fast, so the sign warns you early to slow down. Iowa Driver's License Manual, p.11: “A reflective orange triangle on the rear of a vehicle means it is traveling 35 mph or less.”

What does the number on an Interstate mile marker count?

Miles since the route entered the state. Counting from the state line lets you work out how far you are from your exit. Iowa Driver's License Manual, p.11: “Mile markers show the number of miles from where the Interstate route entered the state you are traveling in.”

What does the shape of a route sign tell you?

The type of roadway it is. Following the right shape keeps you on your route when two roads share a number. Iowa Driver's License Manual, p.11: “The shape of a route sign indicates the type of roadway it is - interstate, U.S. highway, Iowa route, county road, etc.”

What must you do at a solid red traffic light?

Come to a complete stop. A red light means cross traffic has the right to go. If you roll on, you drive into their path. Iowa Driver's License Manual, p.11: “Solid red Come to a complete stop.”

You want to turn left and the signal shows a steady red arrow. What must you do?

Stop and do not make the turn. A red arrow is a red light just for your turn. Cars or people are crossing the path you would turn into. Iowa Driver's License Manual, p.11: “Steady red arrow Drivers turning left or right must stop.”

Why must you never stop your car on railroad tracks?

Trains cannot stop quickly. A train can take a long way to stop. If your car sits on the tracks, the train cannot stop in time to miss it. Iowa Driver's License Manual, p.12: “Use extra caution at railroad crossings and never stop your vehicle on the railroad tracks.”

A school bus must stop how far from railroad tracks before crossing?

Within 15 to 50 feet. These vehicles carry many people or dangerous loads. A full stop gives the driver time to look and listen for a train. Iowa Driver's License Manual, p.12: “carrying passengers for hire (such as Uber or Lyft), and all vehicles required to be placarded for hazardous materials, must stop within 15 to 50 feet of railroad tracks before crossing.”

Your car stalls on railroad tracks and you see no train. What should you do first?

Get everyone out and far away. A train can arrive fast and cannot stop. Saving people matters more than saving the car. Iowa Driver's License Manual, p.12: “If your vehicle gets stuck or stalls at a crossing, get everyone out and far away immediately, even if you do not see a train.”

What does this sign mark?

A railroad crossing. It marks the spot where the road meets the tracks. Treat it as a place where a train may come at any time. Iowa Driver's License Manual, p.7: “Railroad crossing signs are placed at each crossing.”

What should you expect after passing this sign?

A work zone with road work. Workers may be on or near the road ahead. Slow down and be ready for lanes to change. Iowa Driver's License Manual, p.14: “Orange is the basic color of these signs and warning devices.”

What is the basic color of work zone signs and devices?

Orange. Spotting orange early tells you road work is near, so you have time to slow down. Iowa Driver's License Manual, p.14: “Orange is the basic color of these signs and warning devices.”

What do white lane lines separate?

Traffic moving in the same direction. Knowing the line color tells you whether cars beside you go your way or come toward you. Iowa Driver's License Manual, p.15: “White lines separate traffic moving in the same direction.”

Which way do the triangles in a yield line point?

Toward approaching vehicles. The triangles point at you to show you are the one who must yield, not the cross traffic. Iowa Driver's License Manual, p.15: “Yield lines consist of a row of solid white triangles pointing toward approaching vehicles.”

A red light requires you to stop. Where must your car stop?

Before the stop line or crosswalk. Stopping past the line puts your car where people walk and where cross traffic turns. Iowa Driver's License Manual, p.15: “When required to stop because of a sign or signal, you must stop before your vehicle reaches the stop line, or a crosswalk if there is one.”

What lines usually mark a reversible lane?

Double-dashed yellow lines. The same lane may be yours in the morning and the other side's at night. The lines warn you to check first. Iowa Driver's License Manual, p.15: “These lanes are usually marked by double-dashed yellow lines.”

Who may use a shared center left-turn lane?

Left-turning drivers from either direction. Drivers from both sides use the same middle lane. Watch for a car coming at you in it to turn as well. Iowa Driver's License Manual, p.16: “Shared left-turn lanes are reserved for vehicles making left turns from either direction.”

A white diamond painted in a lane usually means what?

The lane is reserved for special use. The diamond tells you the lane is kept for special vehicles, such as buses or cars with riders. Iowa Driver's License Manual, p.16: “Reserved lanes are marked by signs stating that the lane is reserved for special use, and often have a white diamond posted at the side of the road and/or painted on the road surface.”

On a road with two lanes going your way, what is the left lane mainly for?

Passing. Keeping the left lane open lets faster cars pass without weaving around you. Iowa Driver's License Manual, p.16: “On a road with two or more lanes traveling in the same direction, the left lane is generally used for passing.”

How are bicycle lanes marked?

Solid white lines and bike markings. Knowing how a bike lane looks keeps you from drifting into it where riders are. Iowa Driver's License Manual, p.17: “Bicycle lanes are portions of the roadway that are intended for use by bicyclists and are marked by solid white lines, along with bicycle pavement markings and signs.”

How is a rectangular rapid flashing beacon turned on?

By a push button pressed by hand. The beacon flashes only after a person asks to cross, so a flashing beacon means someone is there. Iowa Driver's License Manual, p.18: “Rectangular Rapid Flashing Beacons are manually activated by a push button and are often located at intersections without traffic signals or at mid-block crosswalks.”

When does a pedestrian hybrid beacon operate?

Only when a pedestrian activates it. Most of the time the beacon sits dark, so cars can move freely until a walker needs to cross. Iowa Driver's License Manual, p.18: “These beacons operate only when activated by a pedestrian.”

A person is walking with a cane that is white with a red tip. What does this most likely mean?

The person is likely visually impaired. A person who cannot see your car may step into your path, so you must take extra care near them. Iowa Driver's License Manual, p.18: “walking with a cane that is white or white with a red tip, the person is likely visually impaired.”

What does Iowa's right-of-way law do?

It says which driver must yield. No driver owns the road, so you cannot force your way in just because the other driver should wait. Iowa Driver's License Manual, p.18: “The law says who must yield the right-of-way;”

When may you turn right on a red light in Iowa?

Unless a sign prohibits it. A right turn on red keeps traffic moving, but some corners are too risky, so a sign forbids it there. Iowa Driver's License Manual, p.19: “Right turns on red are permitted unless there is a sign prohibiting them.”

You are pulling out of a parking lot across a sidewalk. Who must you yield to?

Pedestrians on the sidewalk. People on a sidewalk do not expect a car to cut across, and a car pulling out can easily hit them. Iowa Driver's License Manual, p.19: “Drivers crossing a sidewalk, entering or exiting a driveway, alley, or parking lot must yield to pedestrians.”

At an all-way stop, which driver goes first?

The first to arrive and fully stop. Taking turns in the order cars arrive keeps two drivers from pulling out at once and colliding. Iowa Driver's License Manual, p.19: “At an all-way stop, the driver reaching the intersection first gets to go first (after coming to a complete stop).”

You come to an intersection with no stop sign or traffic signal. What must you do?

Slow down and approach carefully. With no sign to tell anyone to stop, each driver has to be ready in case the other does not yield. Iowa Driver's License Manual, p.19: “At an intersection where there is no stop sign or traffic signal, it’s the responsibility of all drivers to slow down and approach carefully.”

Which flashing lights on an emergency vehicle mean you must yield to it?

Red or blue flashing lights. Police, fire and ambulance crews are rushing to help someone, and every second can matter. Iowa Driver's License Manual, p.19: “Yield the right-of-way to a police vehicle, fire engine, ambulance, or other emergency vehicle using a siren or air horn, and/or red or blue flashing lights by taking the following actions:”

You are behind a school bus on a two-lane road and its amber warning lights begin flashing. What should you do?

Do not pass, and be ready to stop. Children may be about to get on or off, and they can step out where a passing car cannot see them. Iowa Driver's License Manual, p.20: “When you see flashing red or amber warning lights, you are not permitted to pass the school bus and should be prepared to stop.”

On a four-lane highway, you are behind a school bus that stops with its stop arm out. What must you do?

Stop behind the bus and wait. Children cross on the side where you are, so extra lanes do not make it safe to pass from behind. Iowa Driver's License Manual, p.20: “When approaching from the rear, the rules are the same as for a two- or three- lane road.”

When you park next to a curb, what is the farthest your car may be from it?

18 inches. A car parked far from the curb sticks out into the lane where other cars can hit it. Iowa Driver's License Manual, p.21: “If there is a curb, park within 18 inches of the curb or closer.”

You may not park closer than how far to a fire station entrance?

20 feet. Fire trucks need room to pull out and turn fast when a call comes in. Iowa Driver's License Manual, p.21: “Closer than 20 feet from a fire station entrance.”

Which of these is a place where parking is not allowed?

On a bridge outside city limits. A bridge or tunnel has no room to go around a parked car, so it blocks the whole lane. Iowa Driver's License Manual, p.21: “On any bridge outside city limits or in highway tunnels.”

Who may park in a space reserved for persons with disabilities?

Only drivers who have the permit. These spaces are near the door and wider, and people who need them have no other way in. Iowa Driver's License Manual, p.21: “Only park in a space reserved for persons with disabilities if you have a Persons with Disabilities Parking Permit.”

What does Iowa's Move Over or Slow Down Law first ask you to do when you near a stopped vehicle with flashing lights?

Change lanes away from it. People work right next to these stopped vehicles, and an extra lane of space keeps passing cars away from them. Iowa Driver's License Manual, p.22: “Iowa’s Move Over or Slow Down Law requires motorists to change lanes when approaching any of the following stopped vehicles displaying flashing lights:”

You are in a minor crash with no injuries, and your car can still be safely driven. What does Iowa law require?

Move it out of the traffic lanes. A car stuck in a lane can cause a second crash, and the danger grows each minute it stays there. Iowa Driver's License Manual, p.22: “If you are involved in a crash with no injuries, Iowa law requires that you move your vehicle out of the driving lanes of traffic if the vehicle is operable and can be safely moved.”

Where do you find the maintenance schedule you should follow for your car?

In the vehicle owner's manual. The people who built the car know when each part needs care. Skip it and a part can fail when you need it most. Iowa Driver's License Manual, p.23: “Follow the recommended maintenance schedule listed in the vehicle owner’s manual.”

Which two braking systems must a car have?

A foot brake and a parking brake. If one brake fails, the other can still stop the car or hold it still on a hill. Iowa Driver's License Manual, p.23: “Cars, trucks, and ATVs/UTVs need two separate braking systems, a foot brake and a parking brake.”

How should you check that your brake lights and turn signals work?

Look at them from outside the vehicle. You cannot see your own brake lights from the seat. A burned-out bulb means drivers behind you get no warning. Iowa Driver's License Manual, p.24: “Ensure signals, brake lights, taillights, and headlights are operating properly by checking them from outside the vehicle.”

Why should you replace a cracked or damaged windshield?

It can break more easily in a minor crash. A cracked windshield can shatter in a small bump or when a stone hits it, and the crack itself can hide a hazard. Iowa Driver's License Manual, p.24: “Damaged glass can break more easily in a minor collision or when something hits the windshield.”

What can worn or bald tires do?

Increase your stopping distance. Tires with little tread cannot push water out of the way or grip the road, so the car slides farther before it stops. Iowa Driver's License Manual, p.24: “Worn, bald, or unbalanced tires can increase your stopping distance, cause hydroplaning (See page 60), cause faster tire wear, reduce fuel economy, and make the vehicle harder to steer and stop.”

Which of these is a sign your steering needs a mechanic?

The car does not turn when the wheel first turns. Steering that lags can leave you unable to dodge a hazard or make a sharp turn in time. Iowa Driver's License Manual, p.25: “If the vehicle is hard to turn or does not turn when the steering wheel is first turned, have the steering checked by a mechanic.”

When should you adjust your seat and mirrors?

Before you start driving. Reaching for a mirror while moving takes your eyes off the road and your hands off the wheel. Iowa Driver's License Manual, p.25: “Adjust the driver’s seat and mirrors before driving to ensure they’re set correctly for you.”

How should you set the inside rearview mirror?

So it frames the entire rear window. If the mirror shows the roof or a side window, you lose part of the road behind you. Iowa Driver's License Manual, p.25: “Sit up straight in the driver’s seat and adjust the inside mirror so that it frames the entire rear window.”

When do driver-assistance features keep drivers safer?

Only when they are used correctly. A feature you do not understand can give you false trust and let you miss a danger it was never built to catch. Iowa Driver's License Manual, p.26: “Features like automatic emergency braking, blind spot monitoring, and forward collision warning keep us all safer, but only if they’re used correctly.”

Most vehicle warning systems are passive. What does that mean?

They warn you but do not prevent the crash. A warning only buys you time. You still have to brake or steer, or the crash happens anyway. Iowa Driver's License Manual, p.27: “Most of these technologies are passive, meaning they warn the driver of a potential issue but do not automatically prevent a problem or crash.”

What does a back-up warning do?

Scans behind you in reverse and alerts you. Small children and low objects are hard to see from the seat, so the sensor gives you an extra warning. Iowa Driver's License Manual, p.27: “Uses rear sensors to scan for objects behind the vehicle and alerts you if an object is detected.”

When may a blind spot monitor give an extra warning?

When you signal with a vehicle in that lane. The extra warning comes right when you are about to move into a car you have not seen. Iowa Driver's License Manual, p.27: “An additional warning may occur if a driver uses their turn signal when there are other vehicles in the lane.”

When does a rear camera turn on?

When you shift into reverse. The screen shows what is behind you only while you back up, so it helps most in tight spots. Iowa Driver's License Manual, p.28: “When the driver shifts into reverse, the rear camera activates to show the area behind the vehicle.”

At about what speed does bicycle, pedestrian, and obstacle detection generally work?

25 mph. These sensors are built for slow, close-up driving like city streets, not for spotting things far down the highway. Iowa Driver's License Manual, p.29: “Alerts you when a bicycle, pedestrian, slow-moving or stationary obstacle has been detected when driving at low speeds, generally around 25 mph.”

Does a forward collision warning system brake the car for you?

No, the warning alone does not brake. If you think the car will stop itself and it does not, you hit the car ahead. Iowa Driver's License Manual, p.30: “The warning alone will not automatically brake for the driver.”

A high-speed alert sounds. How should you slow down?

Release the gas or brake lightly. Slamming the brakes can make the car behind you hit you. Ease off the gas instead. Iowa Driver's License Manual, p.30: “If a warning sounds, you should carefully slow the car to the appropriate posted speed limit by releasing the accelerator or lightly braking.”

What does a lane departure warning rely on to work?

Roadway markings. On a road with faded or snow-covered lines, the system may not know where your lane is. Iowa Driver's License Manual, p.30: “This feature relies on roadway markings to operate.”

While parking, your parking sensors give a constant tone. What does it mean?

You are close to an object. Knowing the tone tells you to stop before you tap a pole or another car. Iowa Driver's License Manual, p.31: “A constant tone means the vehicle is close to an object.”

What does a rear cross-traffic alert detect?

Vehicles coming from the left and right. Backing out of a parking space, you often cannot see a car coming down the row from the side. Iowa Driver's License Manual, p.31: “Sensors around the rear of the vehicle detect other vehicles approaching from the left and right.”

With driver assistance systems, who may still need to act to prevent a crash?

The driver of the vehicle. The car helps, but it does not take over. You still need to be ready to brake or steer. Iowa Driver's License Manual, p.31: “The driver may still need to make changes to the operation of the vehicle to prevent a problem or crash, but the vehicle assists.”

When will lane keeping assist fail to work?

When lane lines are faint or covered by snow. The system steers by reading the painted lines. When snow or dirt hides them, it cannot see where your lane is. Iowa Driver's License Manual, p.32: “This feature will not work when lane lines are faint or covered with snow or dirt.”

When is it advised not to use adaptive cruise control?

In bad weather or other unsafe conditions. On wet or icy roads you need to ease off the gas yourself the moment grip changes. Cruise control keeps pushing the car along. Iowa Driver's License Manual, p.33: “In bad weather and other unsafe driving conditions, it is advised not to use any cruise control, including ACC.”

What is a blind spot?

An area you cannot see using your mirrors. A car can sit right beside you and not show up in any mirror. Knowing this is why you turn your head before you move over. Iowa Driver's License Manual, p.34: “Blind spots are areas outside your vehicle that cannot be seen using mirrors.”

Where do sun glare and reflection blind spots most often happen?

The front windshield. Sun glare on the windshield can hide a car or a person right in front of you. Pulling down the visor helps you see again. Iowa Driver's License Manual, p.34: “The front windshield is the most common place for glaring reflections and blind spots.”

In Iowa, can an officer stop you only because you are not wearing a seat belt?

Yes, it is a primary offense. Police do not need to see you speed or run a light first. Being unbuckled is enough to get you pulled over. Iowa Driver's License Manual, p.34: “Not wearing a seat belt is considered a primary offense, meaning that you can be stopped for the sole purpose of non-compliance with the seat belt law.”

Where should your lap belt sit?

Snugly across your hips. A belt worn high or loose can slide up into your stomach in a crash. Low and snug on the hip bones is where it holds you best. Iowa Driver's License Manual, p.34: “Wear your lap belt snugly across your hips.”

A child is under 1 year old and weighs less than 20 pounds. How must the child ride?

In a rear-facing child restraint. A baby's neck is too weak to take a hard stop. Facing the rear spreads the crash force across the baby's whole back. Iowa Driver's License Manual, p.35: “A child under one year old and weighing less than 20 pounds must be secured in a rear-facing child restraint system.”

Is it safer to be thrown clear of a car in a crash?

No, you are safer staying inside the car. People thrown from a car often land in the road or get hit by another vehicle. The belt keeps you inside, where the car protects you. Iowa Driver's License Manual, p.35: “Your chances of not being killed in a crash are much better if you stay inside the car.”

At 60 mph, how much force can a loose 20-pound object exert in a sudden stop?

Over 1,000 pounds. A bag or toolbox on the back seat keeps moving when the car stops. It can hit someone as hard as a heavy weight. Iowa Driver's License Manual, p.35: “At 60 miles per hour, a 20-pound object has the potential to exert well over 1,000 pounds of force in a sudden stop.”

Looking at a GPS screen while driving is which kind of distraction?

Visual. When your eyes are off the road, you cannot see a car stopping in front of you. A glance at a screen is enough to miss it. Iowa Driver's License Manual, p.36: “Visual — doing something that requires the driver to look away from the driving task.”

You need to reply to a text. What must you do first?

Stop completely off the traveled roadway. Even stopped at a red light you are still in traffic and must be ready to move. Pull off the road before you touch the phone. Iowa Driver's License Manual, p.36: “Before writing, sending, or reading a text message, email, or social media post, the vehicle must be brought to a complete stop off the traveled portion of the roadway.”

Under Iowa's hands-free law, how may a driver use a phone while driving?

Only in hands-free mode. Holding a phone takes a hand off the wheel and pulls your eyes down. Hands-free use keeps both on the drive. Iowa Driver's License Manual, p.36: “New legislation prohibits drivers from using electronic communication devices while driving—unless the device is used hands-free.”

You are 16 with an instruction permit. When may you talk on the phone in the car you are driving?

Only at a complete stop off the road. New drivers are still learning to handle the car. Even a hands-free call takes away the focus they need most. Iowa Driver's License Manual, p.36: “Drivers under the age of 18 with an instruction permit, intermediate license, or special minor restricted license are prohibited from making and receiving calls and talking on the phone while driving unless their vehicle is at a complete stop off the traveled portion of the roadway.”

For a driver 21 or older, what BAC counts as operating while intoxicated in Iowa?

.08 or higher. At .08 your reaction time and judgment are badly hurt. The law draws the line there for drivers 21 and older. Iowa Driver's License Manual, p.37: “having a blood alcohol concentration (BAC) of .08 or higher or operating with any amount of controlled substance in your system.”

What do you agree to just by holding an Iowa driver's license?

To a sobriety test when police ask. Driving is a privilege that comes with conditions. Agreeing to be tested is one of them, set when you get your license. Iowa Driver's License Manual, p.37: “As a holder of an Iowa driver’s license, you are contractually agreeing to consent to a field sobriety test upon demand by law enforcement”

How long is your license revoked if you refuse a breathalyzer test?

1 year. Saying no to the test is punished harder than failing it, so refusing never helps you keep your license. Iowa Driver's License Manual, p.37: “The consequences for refusing a breathalyzer test are more severe than failing a test, with an automatic one year revocation of your license and a minimum $1,250 fine.”

For a driver under 21, what BAC counts as operating while intoxicated?

.02 or more. Drivers under 21 cannot legally drink at all, so the limit is set close to zero. Even one drink can put you over it. Iowa Driver's License Manual, p.37: “with a BAC of .02 or more.”

Where in a car may an open container of alcohol be carried?

In the trunk. Keeping open drinks out of reach stops anyone in the car from drinking on the road. The trunk is out of reach. Iowa Driver's License Manual, p.37: “Open containers of alcoholic beverages may be transported in the trunk of a vehicle.”

Being awake for how many hours straight is as impairing as a BAC of 0.08?

18 hours. Your body does not care why you are slow to react. A long day awake hurts your driving as much as drinking. Iowa Driver's License Manual, p.37: “Being awake for 18 hours straight is as impairing as a blood alcohol concentration (BAC) of 0.08 percent, which is legally drunk and leaves you at equal risk for a crash.”

What can you check on Iowa 511 before a trip?

Current travel conditions. Knowing about a closed road or an ice storm before you leave lets you pick a safer route or wait it out. Iowa Driver's License Manual, p.38: “Visit www.511ia.org or download the free mobile app to stay up to date on the latest travel conditions for Iowa highways and interstates.”

On an automatic gear selector, what does P (Park) do?

Locks the vehicle for parking. Park holds the car still. If you leave it in another gear, the car can roll away when you get out. Iowa Driver's License Manual, p.39: “P – “Park” locks the vehicle for parking”

When shifting a manual transmission, which foot presses the clutch?

Your left foot. The clutch frees the engine from the wheels so the gears can change without grinding. Iowa Driver's License Manual, p.40: “Step 1: Depress the clutch with your left foot”

Which of these affects how long it takes your wheels to stop?

The condition of the car's tires. Worn tires and a heavy load both make a car take longer to stop, so leave more room. Iowa Driver's License Manual, p.40: “The time it takes your wheels to stop depends on the vehicle’s weight, size, and load, as well as the condition of its tires.”

What is the shortest following distance a beginning driver should keep in normal conditions?

3 seconds. New drivers react more slowly. Three seconds gives you time to see a problem and brake. Iowa Driver's License Manual, p.41: “An inexperienced or beginning driver should maintain at least a three-second following distance under normal driving conditions.”

When you drive out of a driveway or alley, where must you stop?

Before crossing the sidewalk. People walk on the sidewalk without looking for cars. Stopping first keeps you from hitting them. Iowa Driver's License Manual, p.41: “Before crossing a sidewalk when exiting a private roadway, driveway, alleyway, etc.”

Your car has ABS and you must stop quickly. What should you do?

Press the brake pedal hard and keep pressing. ABS keeps your wheels from locking up, but only while you hold the pedal down hard. Iowa Driver's License Manual, p.41: “Press on the brake pedal as hard as you can and keep pressing.”

What is the minimum speed on the interstate system?

40 mph. A car going far slower than the rest is a hazard. Fast cars come up on it before they can react. Iowa Driver's License Manual, p.42: “On the interstate system there is a minimum speed of 40 mph.”

If no speed limit is posted, what is the limit in a business district?

20 mph. Shops bring crowds, parked cars and people stepping into the street, so you must go slowly. Iowa Driver's License Manual, p.42: “20 mph in any business district”

Where should your hands be on the steering wheel?

9 and 3 o'clock. This grip keeps your arms out of the way if the airbag goes off and gives you good control. Iowa Driver's License Manual, p.42: “Your hands should be placed on opposite sides of the steering wheel at 9 and 3 o’clock or slightly lower at 7 and 5 o’clock.”

Which steering method does the manual name for turning corners?

Push-pull technique. These methods keep both hands working the wheel, so you stay in control through the whole turn. Iowa Driver's License Manual, p.42: “or the “push-pull” technique.”

At what speed should you back up?

Slowly, using the gas with care. It is harder to control a car in reverse, so a slow speed gives you time to stop. Iowa Driver's License Manual, p.43: “Backing up should be done at slow speeds.”

What should you avoid when making a turn?

Cutting the corner or swinging wide. Cutting a corner puts you in the other lane, and swinging wide invites a car to slip in beside you. Iowa Driver's License Manual, p.43: “Do not cut corners, and do not swing wide on your turns.”

Where the speed limit is 45 mph or less, how far before a turn must you signal?

At least 100 feet. Other drivers need a few seconds of warning to slow down or keep clear of your turn. Iowa Driver's License Manual, p.43: “Iowa law requires you to signal at least 100 feet before a turn if the speed limit is 45 mph or less and if the speed limit is faster than 45 mph, you must signal at least 300 feet before you turn.”

Before turning right on a red light, what must you do?

Come to a complete stop and yield. The other drivers have a green light. Stopping first lets you see them and wait your turn. Iowa Driver's License Manual, p.43: “Prior to safely turning, you must come to a complete stop and yield to all other traffic.”

You need to move two lanes to the left. How should you do it?

Move over one lane at a time. Crossing two lanes at once gives drivers in the middle lane no time to see you coming. Iowa Driver's License Manual, p.44: “Only change lanes one lane at a time.”

How many vehicles should you pass at one time?

1 vehicle at a time. Passing a line of cars keeps you in the oncoming lane much longer, with nowhere to go if a car appears. Iowa Driver's License Manual, p.45: “As a rule, only pass one vehicle at a time.”

What does a double yellow center line mean?

No passing in either lane. Double yellow lines mark stretches where it is unsafe for anyone to cross into oncoming traffic. Iowa Driver's License Manual, p.45: “No passing in either lane.”

How close to an intersection is passing illegal?

Within 100 feet. A car may turn or pull out at a crossroad right when you are in its path in the wrong lane. Iowa Driver's License Manual, p.46: “Do not pass within 100 feet of an intersection.”

How far ahead should you scan the road while driving?

20 to 30 seconds. Looking far ahead lets you spot trouble early, while you still have time to slow or move over. Iowa Driver's License Manual, p.47: “Check your mirrors frequently and scan conditions 20 to 30 seconds ahead of you.”

What makes a roadway safest?

All cars going the same speed, within the limit. When some cars go faster or slower than the rest, there is more passing and lane changing, and more crashes. Iowa Driver's License Manual, p.48: “The safest roadways are when all vehicles travel the same speed but do not exceed the speed limit.”

If you are being tailgated, what should you do?

Move slightly right and signal early. A driver right on your bumper needs more warning than usual, since they have little room to stop. Iowa Driver's License Manual, p.48: “If you are being tailgated, move slightly to the right and give the tailgater a better view of what is ahead and signal early for turns, stops, or lane changes.”

When does Iowa law require you to use both headlights?

From sunset to sunrise. Lights help you see the road and let other drivers see you after the sun goes down. Iowa Driver's License Manual, p.49: “Iowa law requires the use of both headlights from sunset to sunrise or whenever visibility is 500 feet or less,”

When should you use your horn?

When a driver you are passing starts into your lane. A quick tap tells the other driver you are there before they move into you. Iowa Driver's License Manual, p.49: “You are passing a driver who starts to turn into your lane.”

Your car breaks down on the road. What should you try to do first?

Move it off the road and away from traffic. A stalled car in a lane is easy to hit, so getting it off the road is the first step. Iowa Driver's License Manual, p.49: “If possible, safely move your vehicle off the road and away from traffic.”

Which of these counts as an intersection in Iowa's manual?

A driveway. A car can pull out of a driveway or a parking lot just as fast as from a side street, so you watch for it the same way. Iowa Driver's License Manual, p.50: “They include: cross streets, side streets, driveways, parking lots, and roadways open to public travel.”

An oncoming car has its right signal on. When may you pull out in front of it?

Once the car starts to turn. The driver may be turning past you or may have left the signal on by mistake. If you pull out, they hit you. Iowa Driver's License Manual, p.50: “Do not turn just because an approaching vehicle has a turn signal on.”

How should you cross a rural four-lane road that has a median?

Cross one way, then stop in the median. Traffic on these roads moves very fast. Taking one direction at a time means you only have to judge one gap. Iowa Driver's License Manual, p.51: “Do not try to cross both directions of traffic at one time to avoid stopping in the median.”

What is the entrance area of an on-ramp for?

Scanning and planning your entry. Looking early lets you plan your merge before you run out of ramp. Iowa Driver's License Manual, p.51: “This stretch gives you time to scan the roadway and evaluate how much space you have to enter and what speed is needed.”

At a reduced-conflict intersection, how do you cross the four-lane highway from the side road?

Turn right, merge left, then U-turn. You never cut straight across fast traffic. You join it, then turn back at a set spot. Iowa Driver's License Manual, p.52: “Drivers on the side road wanting to turn left or cross the four-lane highway will turn right onto the highway, merge into the left lane and then make a U-turn at a designated median opening.”

What is unusual about a diverging diamond interchange?

You drive briefly on the opposite side. It feels wrong to drive on the left side, so knowing this ahead keeps you from braking or turning by mistake. Iowa Driver's License Manual, p.53: “The unique design is unusual because it directs drivers on the opposite side of the road briefly before diverging back into the correct direction.”

Which way does traffic travel in a roundabout?

Counterclockwise. Everyone going the same way around the island means no one meets a car head-on. Iowa Driver's License Manual, p.54: “Roundabouts are intersections that direct traffic in a counterclockwise direction around a center island.”

When should you pick your lane for a multi-lane roundabout?

Before the yield line. Each lane leads to certain exits. Picking late means a sudden lane change inside the circle. Iowa Driver's License Manual, p.54: “As you approach the roundabout, and in advance of the yield line, select the appropriate lane according to the lane control signs and pavement markings.”

What is the truck apron in a roundabout for?

The rear wheels of long vehicles. A long vehicle cannot make the tight circle without its back wheels riding up on that raised strip. Iowa Driver's License Manual, p.55: “designed to accommodate the rear wheels of long vehicles”

Where should a pedestrian never walk at a roundabout?

Across the lanes to the center island. Cars in the circle are not looking for people in the middle of the lanes, so walking there is very risky. Iowa Driver's License Manual, p.55: “Never walk across the circulating lane(s) in a roundabout to the center island.”

How should you brake and speed up on loose gravel?

Slowly and gently. Tires slide on loose rock. Quick moves can send you into a skid you cannot stop. Iowa Driver's License Manual, p.55: “Slow down, avoid sudden turning, accelerate and brake slowly, and increase your following distance.”

At a gravel-road intersection, what does the manual say about dust clouds?

You cannot always rely on them. A car on a damp road or one moving slowly may raise no dust at all, so no dust does not mean no car. Iowa Driver's License Manual, p.55: “Remember, you can’t always rely on dust clouds to determine if crossing vehicles are approaching.”

You meet an oncoming car on a narrow gravel road. What should you do?

Slow down and move right. With no center line, the two cars share a narrow road. Moving right gives both of you room to pass. Iowa Driver's License Manual, p.56: “Slow down and proceed with caution, moving as far to the right as safe to do so.”

Why must you take great care passing large farm equipment?

It may make a wide turn without warning. A tractor can swing out wide just as you try to pass, and its turn signal can be hard to see. Iowa Driver's License Manual, p.56: “Large farm equipment may make wide turns at unmarked entrances.”

What should you do with your following distance at night?

Make it longer than by day. You can see less far ahead in the dark, so you need more time and room to stop. Iowa Driver's License Manual, p.56: “To compensate for reduced visibility, lower your speed and increase your following distance.”

At what times should you be most watchful for animals?

Sunrise and sunset. Deer move most in the half-light at the start and end of the day, just when they are hardest to see. Iowa Driver's License Manual, p.57: “Be on the lookout for animals while driving, especially at sunrise and sunset.”

Where are a large truck's blind spots, or no-zones?

Around the front, back and sides. A truck driver sits high up and cannot see a car tucked close to the cab or the trailer. Staying out of those spots keeps you from being hit by a truck that never saw you. Iowa Driver's License Manual, p.57: “Large trucks have blind spots, or “no-zones,” around the front, back, and sides of the vehicle.”

How does the stopping distance of a truck or bus compare with a car's?

It is much longer than a car's. A loaded truck is very heavy and needs a long way to stop. If you cut in close in front of it, the driver may not be able to stop in time. Iowa Driver's License Manual, p.57: “Trucks and buses take much longer to stop in comparison to cars.”

A truck with its right turn signal on moves left before the intersection. What is the driver most likely doing?

Swinging wide to make a right turn. A long trailer cuts the corner as it turns. The driver moves left first so the back wheels clear the curb, which can look like a left turn. Iowa Driver's License Manual, p.57: “Truck drivers sometimes need to swing widely to the left in order to safely negotiate a right turn.”

Where are crashes between cars and motorcycles most likely to happen?

At intersections. Drivers turning at a corner often miss a small motorcycle or misjudge how fast it is coming. Check for it, and its speed, before you turn. Iowa Driver's License Manual, p.58: “Intersections are the most likely places for car/ motorcycle collisions to occur.”

When should you look especially hard for people walking, biking or skating?

Before turning at intersections and driveways. People on foot or on bikes are small and easy to miss as you turn. A quick look for them before you start the turn prevents a crash at the corner. Iowa Driver's License Manual, p.58: “Be especially careful to look for pedestrians, bicyclists, skaters, and people using wheelchairs or low-speed micromobility devices before turning at intersections and driveways.”

Who is it safe to leave alone in a closed, parked car on a warm day?

No child, older adult or pet. A parked car heats up fast even with the windows cracked. A child or pet left inside can get heat stroke or die in minutes. Iowa Driver's License Manual, p.59: “NEVER leave children, elderly persons, dependent persons, or pets in an enclosed vehicle alone.”

When does the manual advise keeping an emergency kit in your vehicle?

At all times, and most of all in winter. A storm or a slide into a ditch can leave you stuck for hours. Warm clothes, water, a flashlight and a charger can keep you safe until help comes. Iowa Driver's License Manual, p.59: “It’s also a good idea to keep a vehicle emergency kit with you at all times, especially during winter.”

When should you turn on your windshield wipers?

As soon as the windshield becomes wet. Rain on the glass blurs your view of the road. Waiting until you can hardly see gives you less time to spot a hazard. Iowa Driver's License Manual, p.60: “Turn on the wipers as soon as the windshield becomes wet.”

What causes a car to hydroplane?

Water deeper than the tire tread. When the tires ride on top of water, they stop touching the road. Steering and brakes then do little, and the car can slide. Iowa Driver's License Manual, p.60: “Hydroplaning occurs as a result of water on the road that is deeper than the tire tread.”

How much moving water may be enough to sweep away a vehicle?

As little as 6 inches. Moving water pushes hard and can float a car off the road. Big trucks and SUVs are not safe from it either. Iowa Driver's License Manual, p.60: “As little as 6 inches of water may sweep away a vehicle, including SUVs and pickups.”

Which lights should you use when driving in fog?

Low beams or fog lights. Bright high beams bounce back off the fog like a wall of light. Low beams shine lower and let you see more of the road. Iowa Driver's License Manual, p.60: “Don’t use high beams — they reflect off the fog, causing glare and reduced visibility.”

What does a tornado warning mean?

A tornado is imminent, so seek shelter now. Knowing the difference tells you how fast to act. A warning means there is no time to wait, so find shelter now. Iowa Driver's License Manual, p.60: “If a warning is issued, a tornado is imminent and all persons should seek shelter immediately.”

Before driving in winter, what must be cleared of snow and ice?

The whole vehicle, lights included. Snow on the lights hides your signals from others, and snow on the glass hides the road from you. Clearing only a peephole is not enough. Iowa Driver's License Manual, p.61: “Make sure your ENTIRE vehicle is clear of snow and ice before driving, this includes windows, headlights, turn signals, and taillights.”

How fast do snowplows typically travel?

25-35 mph. A plow moves much slower than other traffic, and it is easy to close on it too fast in blowing snow. Expect it to be slow. Iowa Driver's License Manual, p.61: “Snowplows typically operate at 25-35 mph.”

You are stranded in your car during a snowstorm. Where is the safest place to be?

Inside the car, belted in. Walking off in a storm can get you lost or frozen. Your car gives shelter and is easier for rescuers to find. Iowa Driver's License Manual, p.61: “The safest location is to remain inside your vehicle with your seat belt on.”

A tire suddenly goes flat while you drive. What should you do first?

Hold the wheel tightly and go straight. A flat tire pulls the car to one side. A firm grip keeps you in your lane while you slow down. Iowa Driver's License Manual, p.62: “Hold the steering wheel tightly and keep the vehicle going straight.”

Your headlights suddenly go out at night. What should you try first?

The headlight switch a few times. The problem may be a loose switch or one burned-out set of lights. Trying the switch and the high beams may get you light right away. Iowa Driver's License Manual, p.62: “Try the headlight switch a few times.”

Your engine stalls while you are driving. What happens to the steering?

It is hard to turn, but it turns. Power steering stops working when the engine dies, so the wheel feels stiff. Knowing it still turns keeps you from freezing up. Iowa Driver's License Manual, p.62: “The steering wheel will be difficult to turn, but you can turn it.”

Your gas pedal sticks and the car keeps speeding up. What should you do?

Quickly shift to neutral. Neutral cuts the engine off from the wheels, so the car stops speeding up. You can then brake and steer off the road. Iowa Driver's License Manual, p.62: “Quickly shift to neutral.”

Why should you never remove the key while the car is moving?

The steering wheel may lock. A theft lock holds the wheel still when the key comes out. If that happens while moving, you cannot steer and may crash. Iowa Driver's License Manual, p.62: “Never remove the key or allow passengers to touch the key while driving.”

Your brakes stop working. What should you try first?

Pump the brake pedal several times. Pumping can build enough pressure in the brake lines to stop the car. It is the quickest thing to try. Iowa Driver's License Manual, p.62: “Pump the brake pedal several times.”

When you call 911 after a crash, what should you describe?

Injuries and the crash location. Dispatchers send help based on what you tell them. Knowing about injuries and the exact place gets the right help there fast. Iowa Driver's License Manual, p.63: “Be sure to describe as many details as possible including possible injuries and location of the crash.”

Above what amount of property damage must a crash be reported to police?

More than $1,500. Police need a record of serious crashes. Not reporting one can cost you your right to drive. Iowa Driver's License Manual, p.63: “It is state law to report a crash to the police involving injury or death to another person, or property damage of more than $1,500.”

A police car signals you to pull over. Where should you stop?

In a clear area out of the travel lane. Stopping in a lane leaves you and the officer in the path of traffic. A clear spot off the road keeps everyone safe. Iowa Driver's License Manual, p.64: “If you see an official law enforcement vehicle signaling you to stop, carefully pull over to a clear area when it is safe.”

Who may choose to have a special indicator added to an Iowa license or ID?

A driver with autism or hearing loss. The mark lets an officer know ahead of time how best to talk with you. That helps a traffic stop go smoothly for both of you. Iowa Driver's License Manual, p.64: “If you have autism and/or are deaf or hard of hearing, you may choose to have an indicator added to your license or ID.”

Where these come from

Every rule here is checked against Iowa Driver's License Manual, published by the Iowa Department of Transportation, and against the state code itself. Last checked 2026-10-04.