What is a primary reason for the frequency of rear-end collisions on interstate highways?

The primary reason for the frequency of rear-end collisions on interstate highways is that drivers often follow too closely behind the vehicle in front of them. This behavior reduces the amount of time a driver has to react to sudden stops or slowdowns of the traffic ahead.

When vehicles are traveling at high speeds on highways, even a brief moment of inattention or an unexpected change in traffic conditions can lead to a rear-end collision if the following driver isn't maintaining a safe following distance. Maintaining an adequate distance allows drivers enough reaction time to brake safely without colliding with the vehicle in front.

While poor weather conditions, rough road surfaces, and unexpected obstacles can contribute to accidents, the primary catalyst for rear-end collisions remains the issue of tailgating or following too closely. This driving behavior is a significant factor that can often be controlled by the driver, underscoring the importance of maintaining a safe distance on the road.