What is reaction distance? Question What is reaction distance? Answers The distance traveled between seeing a hazard and physically hitting the brakes The distance traveled between a hazard becoming visible and a driver seeing the hazard The distance traveled before a driver realizes they must brake The distance traveled between physically hitting the brake and coming to a complete stop Explanation Reaction distance is the distance traveled between the moment you mentally recognize a hazard and when you physically hit the brakes. This questions appears in the following tests: Illinois Class B Knowledge Test Kansas Class A Knowledge Test Montana Double Tennessee Class A Knowledge Test