# The reaction distance

One of the most important formulas during your driver's license training is the calculation of the stopping distance. This consists of reaction distance and braking distance

In this article we explain what the reaction distance is and how you can easily calculate it yourself with a formula.

## Definition of the reaction distance

The reaction distance is defined as the distance from recognizing a danger to where you begin to brake.

Recognize - decide - react

You drive the car at 50 km/h and see a possible danger. With us humans it takes about 1 second until we have noticed this. The distance you travel during this time is the reaction distance.

## Formula

### to calculate the reaction distance

You can calculate the recation distance with the formula [speed in km/h :10] x 3.

An example:

You drive at a speed of 100 km/h, then the reaction distance is 30 meters, because: (100:10) x 3 = 30 meters

This means that at 100 km/h you will only have your foot on the brake after 30 metres. But your car will still go 100 km/h. 