Stopping distance — New Hampshire Permit Test
Stopping distance on the New Hampshire permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Total stopping distance is the distance a vehicle travels from the time an operator realizes they must stop until the vehicle actually stops.
Braking is only the last part of it. The distance starts when the driver notices, not when their foot moves.
Total stopping distance is the distance a vehicle travels in ideal conditions from the time an operator realizes they must stop until the vehicle actually stops.
The stopping distance of a vehicle increases 4 times when the speed of the vehicle is doubled.
Doubling the speed does not double the distance, it quadruples it, which is why a small increase costs so much room.
The stopping distance of a vehicle increases 4 times when the speed of the vehicle is doubled.
The average perception time for an alert driver is ¾ second to 1 second.
Even fully alert, a driver spends most of a second just registering what they are looking at.
The average perception time for an alert driver is ¾ second to 1 second.
The average driver has a reaction time of ¾ second to 1 second to move their foot from the gas pedal to the brake.
Added to perception time it means nearly two seconds pass at full speed before the brakes do anything at all.
The average driver has a reaction time of ¾ second to 1 second.
At 50 mph on dry pavement with good brakes it can take about 158 feet to stop.
That is more than half a football field, on a good road with good brakes, after the driver has already reacted.
At 50 mph on dry pavement with good brakes, it can take about 158 feet to stop.
On the test
What does total stopping distance measure?
The distance from realizing a stop is needed to stopping. Braking is only the last part of it. The distance starts when the driver notices, not when their foot moves. New Hampshire Driver's Manual, p.16: “Total stopping distance is the distance a vehicle travels in ideal conditions from the time an operator realizes they must stop until the vehicle actually stops.”
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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All New Hampshire permit topics
Where these come from
Every rule here is checked against New Hampshire Driver's Manual, published by the New Hampshire Division of Motor Vehicles, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/NH.pdf (New Hampshire Driver's Manual, Rev. 11/25, New Hampshire Division of Motor Vehicles, retrieved 2026-09-14)
- src/assets/drivers-manuals/NH.pages.txt (plain pdftotext over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 6, folioMarker, nonLawPages, signGalleryPages and the extraction flag, each with its basis)