What is meant by 'reaction distance'?

Answer: B — The distance traveled before a driver reacts to a hazard.

'Reaction distance' refers to the distance that a vehicle travels before the driver is able to take action in response to a hazard. This period includes the time it takes for the driver to perceive the hazard and initiate a response, such as moving their foot from the accelerator to the brake pedal. Understanding reaction distance is crucial for safe driving, as it emphasizes the importance of being alert and prepared to respond to sudden changes in the driving environment. For example, if a driver notices an obstacle in the road, their reaction distance determines how far their vehicle will travel before they can effectively initiate a stop or maneuver to avoid the hazard. The other choices focus on different aspects of the stopping process. The first option discusses the complete stopping distance, which encompasses both reaction and braking distance. The third option specifically addresses the distance traveled while noticing a hazard, which is part of the reaction process but not the whole concept. The fourth option defines the distance related to braking but does not take into account the initial reaction time that occurs before braking begins.