Fog — Maryland Permit Test
Fog on the Maryland permit test — 2 rules, each with the reason behind it and a question on it while it is fresh.
The rules
In fog, reduce your normal driving speed, and when you see headlights or taillights ahead reduce it further, because you must be prepared to stop quickly.
In fog you can only stop within what you can see, and that is very little.
When you see headlights or another vehicle's taillights ahead, reduce your speed even more. You must be prepared to stop quickly.
If the fog is so thick you cannot drive safely, pull completely off the road to a safe location and turn on your emergency flashers.
Stopping on the road in fog is the same as parking where nobody can see you.
If the fog is so thick that you cannot safely drive your vehicle, pull completely off the road to a safe location and turn on your emergency flashers.
On the test
What should you do when you see lights ahead of you in fog?
Reduce your speed even more. In fog you can only stop within what you can see, and that is very little. Maryland Driver's Manual, p.28: “When you see headlights or another vehicle's taillights ahead, reduce your speed even more. You must be prepared to stop quickly.”
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
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Where these come from
Every rule here is checked against Maryland Driver's Manual, published by the Maryland Department of Transportation Motor Vehicle Administration, and against the state code itself. Last checked 2026-09-06.