# Quick Answer: How Does Rain Affect Braking Distance?

## What is the stopping distance in rain?

When driving in wet conditions or in rain the Highway Code advises your total stopping distance will be at least double the distance to stop on a dry surface..

## How is braking distance affected by speed?

The braking distance also depends on the speed of the car, the mass of the car, how worn the brakes and tyres are, and the road surface. … A faster speed increases both thinking and braking distance, increasing the total stopping distance.

## How many car lengths is a safe distance?

Remaining at least 2 seconds from the vehicle in front will provide a distance of one car length per 5 mph, at which ever speed you drive. The 2 second rule is used regardless of speed because the distance between your vehicle and the one in front will extend the faster you travel.

## What is a safe braking distance?

Now, assuming your car has good brakes, at 30 mph, actual stopping distance required averages 45 feet. … At 60 mph: Perception and reaction time of 1.5 seconds results in a traveled distance of at least 132 feet. Actual stopping distance required averages 180 feet.

## What factors increase braking distance?

The braking distance of a vehicle can be affected by:poor road and weather conditions, such as wet or icy roads.poor vehicle conditions, such as worn brakes or worn tyres.a greater speed.the car’s mass – more mass means a greater braking distance.

## How many feet does it take to stop at 35 mph?

136 feetAt 30mph the stopping distance is much greater—109 feet. At 35 mph it goes up to 136 feet, and you’re not really speeding yet. Switch up the numbers to freeway speeds—60 mph has a stopping distance of around 305 feet. That’s the length of an entire football field to stop.

## Why are stopping distances for braking cars increased on wet roads?

Wet Weather and Stopping Distances It takes longer to stop on wet roads because the friction between the car’s tyres and the road surface is reduced. This increases the car’s braking distance, especially when a vehicle’s tyres have less than 3mm tread depth. This can easily turn a near miss into a serious crash.

## What is the 4 second rule?

Remember: The space between your vehicle and a large vehicle behind you on a highway should be four seconds at speeds of 46-70 mph, plus one second for every 10 feet of vehicle length.

## Does braking distance increase speed?

The car’s braking distance also increases as speed increases, with even a relatively small increase in speed increasing the braking distance substantially. For example, the simulator illustrates that if the speed is doubled then the braking distance increases by four times.

## What’s the stopping distance for 40mph?

Stopping distances at different speedsSpeedThinking + braking distanceStopping distance30mph9m + 14m23m (75 feet)40mph12m + 24m36m (118 feet)50mph15m + 38m53m (174 feet)60mph18m + 55m73m (240 feet)2 more rows•Aug 11, 2017

## How much longer does it take to stop on a wet road?

On wet pavement, total braking time increases from 4.6 seconds to 6.1 seconds, and total braking distance shoots up from 271 feet to 333 feet. And it gets worse. In snowy conditions, even with snow tires, total stopping time jumps to 10.6 seconds and 533 feet.