Your Permit Test: What's Federal, and What Your State Decides
Roughly two-thirds of what your permit test asks is the same wherever you take it. The rest is set by your state — and most people fail because they never found out which part was which.
The two layers of every US permit test
Traffic sign shapes and colours, signal meanings, basic right-of-way and safe-driving practice come from federal standards, most visibly the Manual on Uniform Traffic Control Devices. A stop sign is an octagon in all fifty states; yellow means warning everywhere; a crossbuck means yield to trains no matter which tracks you are at. This layer is genuinely universal, and you can learn it once — it stays true if you move.
On top of that sits a state layer: the specific numbers. Speed limits, BAC thresholds, permit ages, required supervised hours, how many questions your test has, how many attempts you get. These are written by your state legislature and DMV, and the spread is real — Utah sets its adult BAC limit at 0.05 while every other state uses 0.08.
We teach the federal layer thoroughly and honestly tell you where the state layer begins. We will not pretend a single page can give you fifty states' numbers accurately — a wrong number here could cost you the test, or worse. What we can do is make sure you know exactly what to look up.
Start with the part that never changes
The federal layer is the highest-leverage hour of permit prep, because none of it is wasted no matter which state you test in. Our road signs quiz covers shapes, colours and the classic traps in twelve questions with explanations.
Look these up for your state before test day
1.Adult BAC limit
Why it varies: Set by state law. Nearly every state uses 0.08, but not all.
Verified example: Utah is the only state at 0.05 (effective December 30, 2018); every other state uses 0.08.
2.Under-21 alcohol threshold
Why it varies: All states have zero-tolerance laws, but the number that counts as a violation differs.
Verified example: Thresholds run from 0.00 (any detectable amount) to 0.02 depending on the state.
3.Minimum age for a learner's permit
Why it varies: Graduated licensing rules are state law and vary by more than a year in places.
4.Supervised driving hours required
Why it varies: The number of practice hours (and how many must be at night) is set by each state.
5.Number of questions and passing score
Why it varies: Each state writes its own test. Neither the length nor the pass mark is national.
Verified example: California's provisional-licence test form runs 46 questions; the state allows 7–8 errors.
6.Attempts allowed and waiting period after failing
Why it varies: How many tries you get, and how long you must wait, is state policy.
Verified example: California allows three attempts before you must reapply; minors wait seven days to retake.
7.Posted speed limits and default limits
Why it varies: The sign shape is federal; the number on it is not. Default limits for residential streets, school zones and highways vary widely.
8.Right turn on red
Why it varies: Generally permitted after a full stop, but specific intersections and some jurisdictions prohibit it.
9.School bus stopping exceptions
Why it varies: The core rule is near-universal, but when a divided highway exempts you differs by state.
10.Fines and penalty points
Why it varies: Amounts, surcharges and how long points stay on your record are entirely state-level.
11.Move-over and hands-free device rules
Why it varies: Most states have both, but what counts as compliance differs in the details.
12.Documents required at the DMV office
Why it varies: Identity, residency and (for minors) parental consent requirements are state-specific.
Where to look them up
Every state publishes a free driver handbook, and every state test is written from it. Search for "[your state] driver handbook" on your state's official DMV, MVA, RMV, BMV or DPS site — the official domain usually ends in .gov. Read the sections matching the checklist above; you are looking for numbers, not prose.
What this page is not
This is not an official DMV resource and it is not affiliated with any state agency. It does not contain your state's question bank. If you want a state-specific practice test, take it from your own state's DMV site — most publish free sample questions. Use this page to know what to look for, and our signs quiz to make the universal two-thirds automatic.
FAQ
How much of the permit test is the same in every state?
There is no published national figure, and honest answer is that it varies by state. Signs, signals, right-of-way and safe-driving practice — the federal layer — make up a large share of every state test. Treat 'roughly two-thirds' as a working estimate, not an official number.
Do road signs really not change between states?
The shapes, colours and standard meanings do not, because they follow the federal MUTCD. States add local signs and set the numbers printed on regulatory signs, but the sign language itself is national.
Why not just publish every state's numbers here?
Because getting one of them wrong could cause someone to fail a test or break a law, and these numbers change when legislatures amend them. A checklist that sends you to the official source stays correct; a table of fifty states' numbers starts rotting the day it is published.
Is the federal layer enough to pass?
No. It is the part you can learn fastest and reuse forever, but every state test also asks about its own rules. Do the universal layer here, then spend your remaining study time on the checklist above.