Required equipment — Missouri Permit Test
Required equipment on the Missouri permit test — 12 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Your vehicle must have at least two functioning white headlights.
Two, because one headlight reads to an oncoming driver as a motorcycle at an unknown distance.
Your vehicle must have at least two functioning white headlights.
Your vehicle must have at least two functioning red taillights and reflectors that other drivers can see from 500 feet.
Five hundred feet is enough distance for the driver behind to slow instead of brake.
Your vehicle must have at least two functioning red taillights and reflectors that other drivers can see from 500 feet.
If your vehicle was made after January 1, 1936, it must have safety glass in all windows.
Ordinary glass breaks into blades. Safety glass was the first equipment law of its kind.
If your vehicle was made after January 1, 1936, it must have safety glass in all windows.
If your passenger car was made after June 30, 1964, it must have two sets of seat belts in the front seat.
Two sets, for the two seats the law has always cared most about.
If your passenger car was made after June 30, 1964, it must have two sets of seat belts in the front seat.
If your vehicle was made after 1967 it must have an inside and an outside rearview mirror.
Two mirrors, because between them they cover most of what is behind you.
If your vehicle was made after 1967, it must have an inside and an outside rearview mirror.
If your vehicle was made after 1967 and does not have a diesel motor, it must have air pollution control devices as originally installed by the manufacturer.
As originally installed, which rules out removing them and calling the car modified.
If your vehicle was made after 1967 and does not have a diesel motor, it must have air pollution control devices.
You must not have bald or mismatched tires on your vehicle.
Mismatched tires behave differently from one another, which is a problem at the moment you most need them not to.
You must not have bald or mismatched tires on your vehicle.
Your vehicle must not have anything on the windshield that reduces your visibility, except labels and stickers required by law and informational signs on the upper portion normally tinted by manufacturers.
The exceptions are narrow, and they are all things that sit where you do not look.
Your vehicle must not have anything on the windshield that will reduce your visibility, except labels and stickers required by law or ordinance
Your vehicle must have an attached exhaust pipe, muffler, and tailpipe.
All three, because the gas has to be carried past the cabin and released quietly.
Your vehicle must have an attached exhaust pipe, muffler, and tailpipe.
Bumpers on passenger vehicles may not exceed 22 inches above the ground when measured at the highest point.
A raised bumper passes over another car's crash structure and goes into the cabin instead.
Bumpers on passenger vehicles may not exceed 22 inches above the ground when measured at the highest point.
Trucks without rear fenders that are registered for over 24,000 pounds must have mud flaps.
Without them the rear wheels throw stones straight at the windshield behind.
Trucks without rear fenders, registered for over 24,000 pounds, must have mud flaps.
Your vehicle's steering mechanism must not have too much play or binding.
Play means the wheel turns before the car does, and binding means it does not turn at all.
Your vehicle’s steering mechanism must not have too much play or binding.
On the test
How many functioning headlights must a Missouri vehicle have?
At least two. Two, because one headlight reads to an oncoming driver as a motorcycle at an unknown distance. Missouri Driver Guide, p.84: “Your vehicle must have at least two functioning white headlights.”
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
- 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.
Where these come from
Every rule here is checked against Missouri Driver Guide, published by the Missouri Department of Revenue, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/MO.pdf (Missouri Driver Guide, Revised August 2026, retrieved 2026-09-14)
- src/assets/drivers-manuals/MO.pages.txt (plain pdftotext over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 2, folioMarker, nonLawPages and the extraction flag, each with its measured basis)