Night and visibility — Pennsylvania Permit Test
Night and visibility on the Pennsylvania permit test — 10 rules, each with the reason behind it and a question on it while it is fresh.
The rules
State law requires headlights between sunset and sunrise, in rain, snow, sleet, hail, fog, smoke or smog, when you cannot see people or vehicles 1,000 feet ahead, in work zones, and any time your wipers are in continuous or intermittent use because of the weather.
The lights are as much about being seen as about seeing.
The headlight and wiper law requires headlights any time your wipers are in continuous or intermittent use because of the weather; daytime running lights are not enough, because your tail lights must be lit as well.
Daytime running lights leave the back of the car dark, which is the end another driver hits.
Failing to use headlights when required brings a fine beginning at $25, which with fees and costs approaches $100.
The fine is small; the reason for it is that nobody could see you.
Pennsylvania law requires low beams whenever you are within 500 feet of an oncoming vehicle, and within 300 feet when you are following one.
High beams fill the other driver's mirror or windshield and take their night vision away.
If a driver coming at you does not dim their high beams, look toward the right side of the road rather than at the lights, and never keep your own high beams on to punish them.
Two blinded drivers on one road is worse than one.
Low beam headlights shine only about 250 feet ahead, and it takes more than 250 feet to stop at 55 miles an hour, so on a dark road you should not drive faster than 45.
Driving faster than your lights means arriving at a hazard you had no time to see.
Clean your headlights at least once a week, because dirty headlights may give only half the light they should.
Half the light is half the road, and you never notice it going.
Traffic fatality rates are three to four times higher at night than in daylight.
Less light means less warning, and everything else follows from that.
In heavy fog use low beams and slow down enough to stop within the distance you can see; high beams bounce light back into your eyes and make it harder to see.
Fog throws your own light straight back at you, so you see less by using more.
If you get caught in dense fog, the best thing is to pull completely off the road, preferably into a parking lot, put your hazard lights on and keep your seat belt fastened until it clears.
Stopping on the road in fog is the same as parking where nobody can see you.
On the test
At what distance of poor visibility does the law require headlights?
When you cannot see 1,000 feet ahead. The lights are as much about being seen as about seeing.
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.
All Pennsylvania permit topics
Where these come from
Every rule here is checked against PA Driver's Manual, published by the Pennsylvania Department of Transportation, and against the state code itself. Last checked 2026-09-06.