TwinMiles10 commonly missed DMV knowledge test questions (2026)
A handful of rules trip up permit test takers again and again, usually because the "obvious" answer feels right but isn't. These ten hold true in most states' driver handbooks, but exact numbers (following distances, alcohol limits) can vary slightly by state - always defer to your own state's handbook where it differs.
1. Right-of-way at a four-way stop
When two cars arrive at the same time, the driver on the right generally goes first. If it's genuinely simultaneous and unclear, drivers typically wave each other through rather than both pulling out - never assume the other driver will stop.
2. What a flashing yellow light means
Slow down and proceed with caution - it is not a command to stop like a red light, and it is not the same as a steady yellow warning you a light is about to turn red.
3. Passing a stopped school bus with flashing red lights
In almost every state you must stop, whether you're behind the bus or approaching from the opposite direction on most undivided roads, and wait until the lights stop flashing and children are clear. This is one of the most heavily enforced rules in the entire handbook.
4. Minimum following distance
The commonly taught baseline is the "three-second rule": pick a fixed point the car ahead passes, and count at least three seconds before you reach the same point. Add at least a second in rain (many handbooks say four seconds or more) and increase it further in poor visibility or on ice - see our full guide to following distance for the detail.
5. What to do if your vehicle starts to hydroplane
Ease off the gas and steer straight - do not brake hard or turn sharply, since your tires have lost contact with the road and sudden inputs can cause a spin.
6. Turning right on a red light
Legal in most states after a full stop, once the way is clear, unless a sign specifically says "No Turn on Red." A few states and many individual intersections restrict it, so always check the signage - don't assume it's always allowed.
7. Distance from a stopped emergency vehicle
Most states require you to move over a lane if possible, or slow down significantly when passing a stopped police car, ambulance or tow truck with flashing lights - commonly known as a "Move Over" law. It applies in nearly every state now, even though the exact wording differs.
8. Using headlights in rain or fog
Low beams, not high beams. High beams reflect off fog and heavy rain back into your own eyes, making visibility worse, not better.
9. Stopping distance at a railroad crossing
Stop between 15 and 50 feet from the nearest rail (the usual range in driver handbooks; some states state only a minimum) when signals are active or a train is visible, never on the tracks themselves, even briefly.
10. What "implied consent" means for a chemical test
By driving with a valid license, you have already agreed to a breath, blood or urine test if lawfully stopped for suspected impaired driving. Refusing doesn't avoid a penalty - it typically triggers an automatic license suspension of its own, separate from any DUI charge.
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