Braking and stopping distance — Arizona Permit Test

Braking and stopping distance on the Arizona permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.

The rules

It takes an average of 1.5 seconds for a person to perceive a threat in the roadway and react to it.

At 60 mph a car covers well over 100 feet in that time before the brakes are even touched. That gap is why you need room ahead.

It takes an average of 1.5 seconds for a person to perceive a threat in the roadway and react to that threat.

Arizona Driver License Manual and Customer Service Guide, p.53

Driver perception time, the time it takes to see and recognize a danger, averages 0.75 seconds.

Before your foot even moves, most of a second goes by just noticing the danger. The car keeps rolling at full speed the whole time.

Driver perception time (length of time it takes to see and recognize a dangerous situation – the average is 0.75 seconds).

Arizona Driver License Manual and Customer Service Guide, p.53

Driver reaction time is the time from seeing the danger to starting to brake.

Seeing the danger is not the same as stopping for it. Your foot still has to move to the pedal, and the car rolls on while it does.

Driver reaction time (time from perception of danger to start of braking – the average is 0.75 seconds).

Arizona Driver License Manual and Customer Service Guide, p.53

Braking distance depends in part on the vehicle's weight, including when it is loaded or towing.

A car full of people or pulling a trailer is heavier and takes longer to stop. Leave more room when you are loaded.

Vehicle weight, including when loaded or towing.

Arizona Driver License Manual and Customer Service Guide, p.53

Knowing the distance needed to stop your vehicle helps you choose a safe driving speed.

If you drive faster than you can stop in the space you can see, anything that appears ahead is a crash you cannot avoid.

The distance required to stop your vehicle is important in helping you choose a safe driving speed.

Arizona Driver License Manual and Customer Service Guide, p.53

On the test

On average, how long does it take a person to perceive a threat in the roadway and react to it?

1.5 seconds. At 60 mph a car covers well over 100 feet in that time before the brakes are even touched. That gap is why you need room ahead. Arizona Driver License Manual and Customer Service Guide, p.53: “It takes an average of 1.5 seconds for a person to perceive a threat in the roadway and react to that threat.”

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.

What it costs

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Where these come from

Every rule here is checked against Arizona Driver License Manual and Customer Service Guide, published by the Arizona Department of Transportation, and against the state code itself. Last checked 2026-09-28.