Stopping distances — New Jersey Permit Test
Stopping distances 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
The faster a vehicle is going, the longer it takes to stop.
Speed does not add to stopping distance, it multiplies it. Doubling speed more than doubles the gap needed.
The faster a vehicle is going, the longer it will take it to stop.
A vehicle travels 88 feet every second at 60 mph.
That is most of a football field in four seconds. It is what a glance at a phone actually costs.
A vehicle travels 88 feet per second at 60 mph.
Most drivers in most traffic have a reaction time of about three-quarters of a second.
Before the brake is touched the car has already moved. That distance is part of every stop.
Most motorists under most traffic conditions have a typical reaction time of ¾ second.
At 30 mph a vehicle needs about 33 feet of reaction distance and 69 feet of braking distance, 102 feet in all.
Thirty miles an hour feels slow in town, and it still takes six car lengths to come to rest.
30 mph 33 ft 69 ft 102 ft
On the test
What is certain about speed and stopping distance?
Higher speed lengthens the stop. Speed does not add to stopping distance, it multiplies it. Doubling speed more than doubles the gap needed. New Jersey Driver Manual, p.52: “The faster a vehicle is going, the longer it will take it to stop.”
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.