Reaction Distance

This formula calculates the distance covered while a person or vehicle is still reacting to a hazard, before any braking or steering change begins. It works because distance equals speed multiplied by time: if you keep moving at a constant speed for a short reaction time, the distance travelled is simply how fast you are moving times how long you keep moving. In driving and motorsport, this helps show why even a brief delay can add several metres to stopping distance.

Use this when estimating how far a car, bike, or athlete travels during the moment between noticing something and starting to brake or change direction. It is especially useful in road safety, racing analysis, and any situation where response delay affects total stopping distance.

• Using kilometres per hour instead of metres per second without converting first
• Mixing up reaction distance with braking distance
• Forgetting that reaction time must be in seconds to match the formula