You are travelling at 100 km/h, have a reaction time of 1 second, and brake normally. What is the stopping distance according to the rule of thumb?

The stopping distance when driving at 100 km/h consists of the reaction distance and the braking distance. The rule of thumb in Germany is:

Reaction distance = (speed in km/h ÷ 10) × 3 = (100 ÷ 10) × 3 = 30 meters
Braking distance (normal braking) = (speed in km/h ÷ 10) × (speed in km/h ÷ 10) = (100 ÷ 10) × (100 ÷ 10) = 10 × 10 = 100 meters

Add these together:
30 meters (reaction) + 100 meters (braking) = 130 meters total stopping distance.

So, when you are traveling at 100 km/h and brake normally, you need about 130 meters to come to a safe stop according to the German rule of thumb. This helps you judge safe following distances and stopping needs in real traffic situations.