What is a common cause of rear-end collisions?

A common cause of rear-end collisions is sudden stops without signaling. When a driver suddenly brakes without giving advance notice through signaling, it leaves little time for the driver behind to react appropriately. This unexpected change in speed can catch the following driver off guard, making it difficult to maintain a safe following distance. Rear-end collisions often occur when the lead vehicle abruptly slows down, and if the driver behind is unable to anticipate this action, a collision is likely to occur.

While driving at night, poor weather conditions, or slow-moving vehicles can contribute to accidents, they are not the primary reason for rear-end collisions. Night driving can reduce visibility, but it doesn't specifically relate to the dynamics of following too closely. Weather conditions can affect stopping distances and traction, but again, they are not directly tied to the unexpected nature of stopping without signaling. Slow-moving vehicles might require careful navigation, but unless they stop suddenly without warning, they are less likely to directly cause a rear-end collision. Thus, the sudden stop without signaling stands out as a clear and teachable factor in rear-end accidents.