You increase your speed from 50 km/h to 100 km/h. How does the reaction distance change in accordance with the rule of thumb?

The reaction distance is the distance your vehicle travels from the moment you recognize a hazard until you begin to brake. According to the rule of thumb, reaction distance increases linearly with speed. This means if you double your speed from 50 km/h to 100 km/h, your reaction distance also doubles. So, if at 50 km/h the reaction distance is about 15 meters, at 100 km/h it becomes roughly 30 meters. This is because your vehicle covers twice the distance in the same reaction time when you double your speed. Understanding this helps you gauge safe stopping distances at various speeds.