By which rule of thumb can you determine the braking distance in metres from speed when braking normally?

To determine the braking distance in meters from the speed when braking normally, you typically use the formula that involves the speed in km/h divided by 10, multiplied by itself. This is often summarized in the form of a rule: the braking distance can be approximated by the formula (Speed in km/h / 10) x (Speed in km/h / 10).

This formula is effective because it helps drivers understand how much distance they will need to stop safely at various speeds, which is crucial for maintaining safety on the road. German traffic regulations emphasize the importance of understanding braking distances to prevent accidents and ensure adequate stopping distance, especially in varied conditions like wet or icy roads.

The other options you mentioned involve factors like multiplying by 5 or 3, which are simplified estimations for different driving conditions or emergency stops but do not provide the precise braking distance needed for normal braking situations. Therefore, recognizing and using the complete formula allows for more accurate assessments when driving, which aligns with safe driving practices outlined in German traffic rules.