What is reaction distance?
Correct answer: A – The distance traveled after recognizing a hazard but before physically applying the brakes
Reaction distance is how far the vehicle continues traveling after the driver recognizes a hazard and before the brakes are physically applied. It is separate from perception distance and braking distance. Under ideal conditions, the manual uses a reaction time of three-quarters of a second to one second.
Source: Alaska Commercial Driver License Manual — § 2.6.1, “Stopping Distance”

