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Nevada driving lesson · Freeway Driving & Stopping

Stopping distance

A 3-minute lesson from the Nevada course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.

Read time
3 minutes
Course unit
Freeway Driving & Stopping
Checkpoint questions
6
Source pages
41

Stopping takes more room than most drivers think. Before your foot touches the brake you've already traveled a long way while noticing and reacting — and braking distance grows much faster than your speed.

Know the rule

The rear-end collision is the number one crash type on Nevada's streets and highways.

Handbook p. 41 ↗

Your stopping distance depends on:

  • The type and weight of your vehicle
  • Your speed
  • The condition of your tires and brakes
  • The road surface and weather conditions
  • Your reaction time, and how alert or tired you are
Handbook p. 41 ↗

Perception and reaction distance

The distance covered while you see and understand the need to stop (perception), your brain signals your foot (reaction), and your foot moves to the brake pedal.

Handbook p. 41 ↗

Reaction time

The time from seeing you need to stop until you step on the brake. It increases when decisions get complex or events are unexpected.

Handbook p. 41 ↗

Braking distance

How far your vehicle travels during braking time — the time the brakes and road friction take to stop the vehicle.

Handbook p. 41 ↗
2 to 2.5 seconds

Normal reaction time, per highway safety studies

Handbook p. 41 ↗
4 times

How much longer your braking distance gets when you double your speed (e.g., 30 to 60 mph)

Handbook p. 41 ↗

Stopping distance (dry, level road, 2.5-second reaction)

Stopping distance (dry, level road, 2.5-second reaction)
SpeedReaction distanceBraking distanceTotal (time)
25 mph92 ft35 ft127 ft (4.40 s)
35 mph128 ft68 ft196 ft (5.14 s)
45 mph165 ft113 ft278 ft (5.90 s)
55 mph202 ft168 ft370 ft (6.66 s)
65 mph238 ft256 ft494 ft (7.86 s)
Handbook p. 41 ↗

Know the rule

On wet highways stopping distances may be more than double those on dry pavement. Take special care in the first rain of a season, when oil and water mix on the pavement.

Handbook p. 41 ↗
373 feet

Stopping distance on ice at 30 mph — well over the length of a football field

Handbook p. 41 ↗
35 to 55 mph

Speeds at which most cars begin to lose traction and hydroplane in heavy rain

Handbook p. 41 ↗

Put it into practice

At 55 mph on dry pavement, you'll travel about 202 feet before you even start braking and 370 feet in all. If traffic stops suddenly ahead, only the space you've left will keep you out of a rear-end crash.

Check your understanding

Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.

What is the number one crash type on Nevada's streets and highways?
  1. Head-on collisions
  2. Rollovers
  3. Rear-end collisions
  4. Side-impact collisions

Answer: Rear-end collisions

The rear-end collision is the number one crash type on Nevada's streets and highways.

Handbook p. 41 ↗
What is considered a normal reaction time for most drivers, according to the handbook?
  1. 0.5 to 1 second
  2. 4 to 5 seconds
  3. 1 to 1.5 seconds
  4. 2 to 2.5 seconds

Answer: 2 to 2.5 seconds

Highway safety studies show normal reaction times are 2 to 2.5 seconds.

Handbook p. 41 ↗
If you double your speed from 30 mph to 60 mph, your braking distance:
  1. Becomes four times as long
  2. Becomes twice as long
  3. Stays about the same
  4. Becomes three times as long

Answer: Becomes four times as long

Doubling your speed makes braking distance four times as long, not twice.

Handbook p. 41 ↗
At 30 mph, what is the approximate stopping distance on ice, according to the handbook?
  1. 150 feet
  2. 373 feet
  3. 250 feet
  4. 500 feet

Answer: 373 feet

At 30 mph, stopping distance on ice would be about 373 feet, over a football field's length.

Handbook p. 41 ↗
Most vehicles begin to hydroplane in heavy rain at speeds between:
  1. 10 and 20 mph
  2. 60 and 80 mph
  3. 20 and 30 mph
  4. 35 and 55 mph

Answer: 35 and 55 mph

Most cars begin to lose traction and hydroplane between 35 and 55 mph in heavy rain.

Handbook p. 41 ↗
Perception and reaction distance together are the time and distance it takes to notice a hazard and begin braking.
  1. True
  2. False

Answer: True

Perception and Reaction Distance covers seeing the need to stop and getting your foot to the brake.

Handbook p. 41 ↗
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