8 Commonly Missed Questions on the Written Drivers Test

1. How much following distance should you keep behind the car ahead?

The answer most states want: at least three seconds. 

Pick a fixed object like a sign or an overpass. When the car ahead passes it, start counting. If you reach the object before three seconds pass, you are following too closely. Some state handbooks teach a longer gap for bad weather or large vehicles, so check yours before test day.

Why people miss it: the answer choices mix car lengths, seconds, and feet in the same question. The test wants the method your handbook teaches, and most handbooks now teach seconds, not car lengths.

2. What should you do when a traffic light turns yellow?

Stop if you can do so safely. 

A steady yellow light means the signal is about to turn red. It is not a signal to speed up. If you are too close to the intersection to stop safely, continue through at your current speed.

Why people miss it: one answer choice always says "speed up to clear the intersection," and it always feels right in the moment. It is always wrong.

3. How far from a fire hydrant can you legally park?

In most states, at least 15 feet. 

Distance rules are the most memorization-heavy part of the test, and hydrant distance is the one that shows up most often. Confirm the exact number in your state handbook, because a few states use a different distance.

Why people miss it: parking distances near hydrants, crosswalks, and stop signs all blur together. Make one flash card that lists all three from your state's handbook and review it the morning of your test.

4. How far before a turn should you signal?

At least 100 feet in most states, and earlier at higher speeds. 

Some states require more distance on highways, often around 200 feet or a set number of seconds. Signal before you brake, not as you turn, so the drivers behind you know what is coming.

Why people miss it: the question often asks about highway speeds, where the correct answer is the longer distance, not the familiar 100 feet.

5. Who goes first at a four-way stop?

The driver who arrived first. 

If two vehicles arrive at the same time, the driver on the left yields to the driver on the right. If you arrive at the same time as the car directly across from you, the one turning left yields to the one going straight.

Why people miss it: the test loves the simultaneous arrival scenario. Remember it as one rule: yield to the right.

6. What should you do if your car starts to hydroplane?

Ease off the gas and keep the wheel steady. 

Do not slam the brakes and do not jerk the steering wheel. Hydroplaning means your tires have lost contact with the road, and sudden inputs make it worse. As your tires regain grip, gently steer where you want to go.

Why people miss it: braking is the instinct, so the "brake firmly" answer choice catches everyone who has never been taught otherwise.

7. When must you stop for a school bus?

When its red lights flash and the stop arm is out, traffic in both directions stops on most roads. 

The common exception is a divided highway with a physical median, where oncoming traffic may not need to stop. This rule varies by state more than any other question on this list, so read your handbook's school bus section twice.

Why people miss it: the divided highway exception. The test asks about the exception, not the easy case.

8. What is the legal blood alcohol limit?

0.08% for drivers 21 and over in most states, and effectively zero for drivers under 21. 

Every state has a zero tolerance law for underage drivers, typically set between 0.00 and 0.02%. If you are studying for a first license, the under 21 limit is the one your test will ask about.

Why people miss it: everyone memorizes 0.08 and forgets the under 21 rule, which is the version most permit test takers actually face.

How Many Questions Are on the Written Test?

Most states use a multiple-choice test of roughly 30 to 50 questions, with a passing score commonly around 70% to 83% depending on the state. For example, the California DMV test has 46 questions and requires 38 correct. Check your state's exact format before test day.

What Happens If You Fail the Written Test?

Most states let you retake the written test after a short waiting period, usually one to three days, though some states require minors to wait about a week. Some states limit the number of attempts within a given timeframe, and each retake may carry an additional fee. The most effective strategy is to study with targeted practice and pass on the first try.

How to Pass the Written Test on the First Try

1. Study the official handbook section by section. Don't just skim it once. The answers all come from your state's driver manual.
2. Take practice tests until you're consistently scoring 85% or higher. That buffer gives you confidence on test day.
3. Focus on the reasoning, not memorization. The test asks you to apply rules to scenarios, not just recall definitions.
4. Drill the specific numbers. Distances, BAC limits, and following times are the most commonly missed, so make flashcards.
5. Use state-specific practice questions. Traffic laws vary, so generic questions won't fully prepare you. I Drive Safely's state-specific practice tests mirror the real exam.

What Can Slow Down Passing the Written Test?

• Studying once and assuming you're ready. The exam tests application, not just recall.
• Skipping the specific numbers. Distances and limits are the most missed topics.
• Using generic practice tests. Your state's rules may differ from the national norm.
• Test-day nerves. Consistent practice scores above 85% build the confidence to stay calm.
• Ignoring the exceptions. School bus medians, BAC tiers, and hill-parking directions are where the test hides its hardest questions.

How Tests Compare Across States

The format and passing score vary. California uses 46 questions with 38 needed to pass, while many states use 30 to 40 questions at a 70% to 80% threshold. The topics, though, are remarkably consistent nationwide, which is why the eight questions above show up almost everywhere. If you're also getting back on the road after a lapse, our guide to renewing an expired license covers when a retest is required.

Get Fully Prepared

The written test measures what you know, and now you know what it measures. I Drive Safely's online drivers ed covers every topic on your state's exam with interactive lessons, state-specific material, and built-in practice so you walk in ready. It's 100% online, self-paced, and designed to get you confident behind the wheel and on test day. See the drivers ed course to get started.