Fatigue — New Hampshire Permit Test

Fatigue on the New Hampshire permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Fatigue can affect a driver’s vision and increase the time it takes to make decisions.

Tiredness does not announce itself. It takes the two things driving depends on, seeing and deciding, and slows both.

Fatigue can affect a driver’s vision and increase the time to make decisions.
New Hampshire Driver's Manual, p.7

A driver who has been awake for a continuous 18 hours will typically perform like a person with a blood alcohol concentration of 0.05%.

It puts a number on something drivers dismiss. Eighteen hours awake is a measurable impairment, not just feeling a bit tired.

a driver who is up for a continuous 18 hours will typically exhibit performance levels similar to that of a person with a Blood Alcohol Concentration (BAC) level of 0.05%.
New Hampshire Driver's Manual, p.7

The average person needs 7 to 9 hours of sleep to maintain proper alertness during the day.

Alertness is built the night before. A driver who shorted themselves two hours is already behind before they start the engine.

the average person needs 7 to 9 hours of sleep to maintain proper alertness during the day.
New Hampshire Driver's Manual, p.7

During long trips a driver should plan to stop at least every 2 hours to stretch or get a drink.

A break resets attention before it is gone, which is cheaper than trying to get it back once the driver is already fading.

During long trips, plan to stop at least every 2 hours to stretch or get a cup of coffee or soft drink.
New Hampshire Driver's Manual, p.7

Before getting too tired a driver should pull off at the next exit or rest area to take a 15 to 20 minute nap.

A short nap is the only thing on the list that actually restores alertness, and it works best taken before exhaustion sets in.

pull off at the next exit or rest area to take a 15 to 20 minute nap or find a place to sleep for the night.
New Hampshire Driver's Manual, p.7

There is no tool such as a sleep breathalyzer available to help law enforcement detect whether a crash was the result of driving on too little sleep.

Drunk driving can be measured at the roadside and drowsy driving cannot, so the responsibility falls on the driver to stop.

Unlike drunk driving, there is no subjective or objective tool
New Hampshire Driver's Manual, p.7

On the test

What does fatigue do to a driver?

Affects vision and increases decision time. Tiredness does not announce itself. It takes the two things driving depends on, seeing and deciding, and slows both. New Hampshire Driver's Manual, p.7: “Fatigue can affect a driver’s vision and increase the time to make decisions.”

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.

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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.