Fog driving — Arizona Permit Test

Fog driving on the Arizona permit test — 3 rules, each with the reason behind it and a question on it while it is fresh.

The rules

When driving in fog, use low beams only and look for road edge markings to guide you.

Fog reflects light back at you, so high beams light up the fog and not the road. Low beams let you see more.

When driving in fog, use low beams only and look for road edge markings to guide you.

Arizona Driver License Manual and Customer Service Guide, p.56

Even light fog reduces visibility and your ability to judge distance, so it is very important to slow down.

In fog a car ahead looks farther away than it is. You can be on top of it before you see it clearly.

Even light fog reduces visibility and your ability to judge distance, so it is very important to slow down.

Arizona Driver License Manual and Customer Service Guide, p.56

If necessary in fog, pull off the road, turn your headlights off and stay there until the fog lifts.

Lights left on off the road can lead a driver behind to follow you onto the shoulder and hit you.

If necessary, pull off the road and turn your headlights off, then stay there until the fog lifts.

Arizona Driver License Manual and Customer Service Guide, p.56

On the test

Which headlights should you use when driving in fog?

Low beams. Fog reflects light back at you, so high beams light up the fog and not the road. Low beams let you see more. Arizona Driver License Manual and Customer Service Guide, p.56: “When driving in fog, use low beams only and look for road edge markings to guide you.”

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.

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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.