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 when braking normally, the correct method involves a specific calculation based on your speed in kilometers per hour. The correct combination from the answer choices emphasizes that you first divide the speed by 10 and then multiply the result by itself. This gives you a more accurate estimate of the braking distance.

In Germany, understanding braking distances is crucial for maintaining safety on the road. The formula reflects the physics of stopping distance, which includes reaction time and factors like road conditions. By using the correct combination of the answers, you ensure that you are accounting for both speed and the necessary safety parameters, helping you to make informed decisions while driving.

Using the other options as standalone measurements does not capture the full complexity of braking distances, which is why the combination involving the square of the speed is essential for accurate calculations.