How is a danger zone defined in relation to vehicle stopping?

A danger zone in the context of vehicle stopping refers specifically to the section of road that is necessary for a vehicle to come to a complete halt safely. This encompasses the distance required to react to a hazard and the actual stopping distance, which can be influenced by several factors including the vehicle's speed, road conditions, and the vehicle's weight.

Understanding this concept is crucial for drivers, particularly in large vehicles like tractor-trailers, which take longer distances to stop compared to smaller vehicles. Knowing the appropriate stopping distance helps ensure that drivers can react appropriately to sudden changes in traffic or road conditions, thereby preventing accidents.

Other options involve aspects of driving and vehicle dynamics, but they do not define the specific limits of a danger zone regarding safe stopping distances. The distance from a traffic light to an intersection primarily considers traffic signals rather than the mechanics of stopping. The area around the vehicle while driving focuses more on spatial awareness than stopping distance. Lastly, the space ahead when driving in heavy traffic is concerned with following distance rather than the mechanics of a vehicle's braking capabilities. Thus, option B precisely addresses the core issue of stopping safety in relation to a danger zone.