A commercial motor vehicle driver traveling at highway speed spots an obstacle in the roadway ahead. After recognizing the hazard, the driver moves their foot from the accelerator to depress the brake pedal. Which stopping distance component specifically measures the distance traveled during this physical driver action, and what is its standard estimated time benchmark?
- APerception distance, with an estimated benchmark of
- BBrake lag distance, with an estimated benchmark of
- Reaction distance, with an estimated benchmark of Answer
- DFollowing distance cushion, with an estimated benchmark of of vehicle length
Answer
Reaction distance, with an estimated benchmark of
Reaction distance is defined as the distance a vehicle travels from the moment the driver decides to brake until the foot physically depresses the brake pedal. Under standard CDL guidelines, an average alert driver requires approximately () for this physical reaction.
Step-by-Step Solution
Key Concept
Components of total stopping distance: perception distance, reaction distance, brake lag distance, and braking distance.
Estimated Time:1m 0s