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What three things add up to total stopping distance for your truck or bus?

A Perception distance, reaction distance, braking distance
Total stopping distance is the sum of your perception distance (how far your vehicle goes from when you see the hazard until your brain processes it), reaction distance (how far the vehicle goes from when your brain orders your foot to take action until your foot actually starts to brake), and braking distance (how far the vehicle continues to travel once you apply the brake).
B Attention distance, reaction distance, slowing distance
C Observation distance, reaction distance, braking distance