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# How do you calculate stopping and braking distances?

## How do you calculate stopping and braking distances?

Stopping distance = thinking distance + braking distance Thinking distance is approximately 1 foot for every mph you travel at, for example, a car travelling at 30mph will travel 30 feet before the brakes are applied.

How is the braking distance for a motorcycle?

Motorcycle Braking distance Most of all, braking distance varies with speed. At 30 mph your braking distance will be 14 metres (about 45 feet) while at 70 mph that distance will increase to 75 metres (about 245 feet). That’s just over double the speed but more than five times the braking distance.

### What is the formula for braking distance?

The braking distance, in feet, of a car traveling at v miles per hour is given by d= 2.2v+\frac{v^2}{20}.

How is the braking distance for a motorcycle related to the speed?

Braking follows a ‘square law’. Twice the speed = 4 times the stopping distance, so stopping from 60 mph takes 180 feet (using the usual parameters but ignoring reaction time), from 120 mph takes 720 feet, and on the same basis a whopping 1620 feet from 180 mph.

## What is the normal stopping distance at 50 km/h on a wet road?

36 metres
The recommend minimum stopping distance of a car driving at 50 km/h under wet conditions is 36 metres.

What is the stopping distance at 25 mph?

Therefore, if you are driving 25 mph, it will take you approximately 56.25 feet to stop your car.

### Are stopping distances the same for cars and motorcycles?

Motorbikes take longer to stop than cars and don’t have as much cornering ability.

How long does it take to stop at 20mph?

At 20 mph during perception and reaction time, a vehicle will travel 45 feet (30 feet per second x 1.5 seconds). Once the brakes are applied, it takes approximately 19 feet to come to a stop, for a total distance of 64 feet.

## What is the stopping distance at 80 mph?

Stopping Distances

Speed Thinking Distance 2 Overall Stopping Distance
50 mph 50 feet 175 feet
60 mph 60 feet 240 feet
70 mph 70 feet 315 feet
80 mph 80 feet 400 feet

How many feet will it take you to stop from 60 mph?

Driver Care – Know Your Stopping Distance

Speed Perception/Reaction Distance Braking Distance
50 mph 73 feet 125 feet
60 mph 88 feet 180 feet
70 mph 103 feet 245 feet
80mph 117 feet 320 feet

### Is there an easy way to remember stopping distances?

Overall Stopping Distance (on dry roads) The factors are easy to remember – just start at 2 for 20mph and add 0.5 for each 10 mph increase in speed. Example: Question: What is the overall stopping distance at 50mph? Answer: Factor for 50mph is 3.5 and so overall stopping distance at 50mph is 50 x 3.5 = 175 feet.

What is the correct stopping distance?

Driver Care – Know Your Stopping Distance

Speed Perception/Reaction Distance Braking Distance
30 mph 44 feet 45 feet
40 mph 59 feet 80 feet
50 mph 73 feet 125 feet
60 mph 88 feet 180 feet