You are travelling at 50 km/h and have a reaction time of 1 second. What is the reaction distance according to the rule of thumb?

Your answer is correct. In Germany, the rule of thumb for reaction distance is: speed (in km/h) divided by 10, then multiplied by 3. So for 50 km/h: 50 divided by 10 is 5, and 5 times 3 is 15 meters. This means, with a reaction time of 1 second at 50 km/h, you travel about 15 meters before you even start braking. This helps drivers estimate stopping distances and react in time to hazards.