Fatigue — South Dakota Permit Test

Fatigue on the South Dakota permit test — 7 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Fatigue is physical or mental tiredness; it can affect vision and increase the time it takes to make decisions.

A tired driver takes an extra second to see brake lights and to decide to stop, and rear-ends the car ahead.

Fatigue can affect vision and increase the time to make decisions.

South Dakota Driver License Manual, p.18

Before a trip, get adequate sleep: most people need 7 to 9 hours to stay properly alert during the day.

A short night of sleep leaves you nodding off on a straight road in the afternoon.

Get adequate sleep – most people need 7 to 9 hours to maintain proper alertness during the day.

South Dakota Driver License Manual, p.18

On a trip, plan to stop about every 100 miles or 2 hours.

Hours of unbroken highway lull a driver into a doze, and the car drifts off the road.

Plan to stop about every 100 miles or 2 hours.

South Dakota Driver License Manual, p.18

Before a trip, arrange for a travel companion, someone to watch your driving, and check medication labels for drowsiness.

A pill that causes drowsiness can put you to sleep at the wheel an hour into the drive.

Arrange for a travel companion – someone to watch your driving.

South Dakota Driver License Manual, p.19

If you start feeling tired, stop driving and 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.

Pushing on while drowsy ends with the car in the ditch or across the center line.

If you start feeling tired, stop driving and 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.

South Dakota Driver License Manual, p.19

To fight fatigue, try consuming caffeine before taking a short nap to get the benefits of both, and try not to drive late at night.

Late-night driving meets your body at its sleepiest, when a few seconds of dozing is enough to crash.

Try consuming caffeine before taking a short nap to get the benefits of both.

South Dakota Driver License Manual, p.19

The best way to avoid fatigue is to get plenty of rest.

No trick on the road makes up for a body that has not slept, and the crash comes anyway.

The best way to avoid fatigue is to get plenty of rest.

South Dakota Driver License Manual, p.19

On the test

How does fatigue affect a driver?

It can affect vision and slow decisions. A tired driver takes an extra second to see brake lights and to decide to stop, and rear-ends the car ahead. South Dakota Driver License Manual, p.18: “Fatigue can affect 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 South Dakota Driver License Manual, published by the South Dakota Department of Public Safety, and against the state code itself. Last checked 2026-10-04.