When driving at higher speeds, stopping distances increase and collisions become more severe due to the larger impact force. Speed directly affects the energy of a vehicle, meaning that the faster it moves, the more forceful its impact will be in the event of an accident. This relationship underscores the importance of controlling speed to ensure sufficient stopping ability, reduce crash severity, and enhance overall driving safety. Adjusting speed according to road, traffic, and weather conditions is crucial for maintaining control and avoiding collisions.