Speed and impact — Kansas Permit Test

Speed and impact on the Kansas permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.

The rules

When a Kansas driver doubles their speed from 20 to 40 mph the impact is 4 times greater and the braking distance is also 4 times longer.

Impact grows with the square of speed, not in step with it. Twice the speed is four times the damage.

When you double your speed from 20 to 40 mph the impact is 4 times greater. The braking distance is also 4 times longer.

Kansas Driving Handbook, p.59

Tripling speed from 20 to 60 mph makes the impact and braking distance 9 times greater in Kansas.

Three times the speed is nine times the force. The arithmetic is why highway crashes are so much worse.

Triple the speed from 20 to 60 mph and the impact and braking distance is 9 times greater.

Kansas Driving Handbook, p.59

Increasing speed to 80 mph makes the impact and braking distance 16 times greater than at 20 mph.

Four times the speed is sixteen times the force. There is no car built that makes that survivable.

Increase the speed to 80 mph and the impact and braking distance are 16 times greater than at 20 mph.

Kansas Driving Handbook, p.59

At 60 mph a Kansas driver's stopping distance is greater than that of a football field.

A football field is a distance everyone can picture. That is the point of the comparison.

At 60 mph, your stopping distance is greater than that of a football field.

Kansas Driving Handbook, p.59

A Kansas driver should look at least ten seconds ahead of the vehicle to avoid panic stops by seeing events and problems well ahead of time.

A panic stop is a problem seen too late. Ten seconds is where you can still slow gently instead.

Look at least ten seconds ahead of your vehicle to avoid panic stops by seeing events and problems well ahead of time.

Kansas Driving Handbook, p.59

Stopping suddenly in Kansas is dangerous and usually means a driver is not paying attention to the traffic flow or is following others too closely.

A sudden stop is a symptom, not an accident. Something was missed earlier that made it necessary.

Stopping suddenly is dangerous and usually means you are not paying attention to the traffic flow or following others too closely.

Kansas Driving Handbook, p.59

On the test

How much greater is the impact when speed doubles from 20 to 40 mph?

4 times greater. Impact grows with the square of speed, not in step with it. Twice the speed is four times the damage. Kansas Driving Handbook, p.59: “When you double your speed from 20 to 40 mph the impact is 4 times greater. The braking distance is also 4 times longer.”

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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All Kansas permit topics

Where these come from

Every rule here is checked against Kansas Driving Handbook, published by the Kansas Department of Revenue, and against the state code itself. Last checked 2026-09-16.