Night driving — New Jersey Permit Test
Night driving on the New Jersey permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Nearly 90 percent of driving decisions are based on what the driver sees.
Night takes most of that away, which is why the same road is a different job after dark.
Nearly 90 percent of driving decisions are based upon what a motorist sees while driving.
At night a driver slows down and drives within the range of the headlights.
Outdriving your lights means the thing in the road appears too late to stop for.
To drive safely at night, slow down and drive within the range of the vehicle’s headlights.
Nighttime stopping figures assume a reaction time of 1.5 seconds, twice the daytime figure.
Everything takes longer to recognize in the dark, and the extra time is spent traveling.
Numbers are based on a motorist’s nighttime reaction time of 1.5 seconds.
At 20 mph on low beams at night a vehicle needs about 75 feet to stop.
Twenty miles an hour still takes four car lengths after dark, and the beam does not reach much further.
20 mph 44 ft 31 ft 75 ft
On the test
How much of driving decision-making is based on sight?
Nearly 90 percent. Night takes most of that away, which is why the same road is a different job after dark. New Jersey Driver Manual, p.100: “Nearly 90 percent of driving decisions are based upon what a motorist sees while driving.”
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 New Jersey Driver Manual, published by the New Jersey Motor Vehicle Commission, and against the state code itself. Last checked 2026-09-15.