Understanding Stopping Distances When Driving Knowing how to work out stopping distances is one of the most important safety skills for any driver. Stopping distance is the total distance your vehicle travels from the moment you notice a hazard to the moment your vehicle comes to a complete stop. Understanding how this works helps drivers judge safe following distances and avoid collisions. Stopping distance is made up of two key parts: thinking distance and braking distance. 1. Thinking Distance Thinking distance is the distance your vehicle travels between noticing a hazard and pressing the brake pedal. Even if you react quickly, your brain still needs a fraction of a second to recognise danger and send a signal to your foot to press the brake. A simple rule is that thinking distance increases directly with speed. For example: Speed Thinking Distance 20 mph 6 metres 30 mph 9 metres 40 mph 12 metres 50 mph 15 metres 60 mph 18 metres 70 mph 21 metres If you double your speed, your...
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