Final answer:
Motorists following too closely risk a rear-end collision if the lead vehicle stops suddenly because it reduces reaction time to stop safely.
Step-by-step explanation:
Motorists who follow other vehicles too closely do indeed risk a rear-end collision if the vehicle in front stops suddenly. This is because maintaining a safe following distance allows a driver enough time to react and stop if necessary, which is crucial for avoiding accidents. Following too closely diminishes this reaction time, increasing the chances of crashing into the vehicle ahead. It's important for drivers to keep a safe distance from the vehicle in front, accounting for factors such as vehicle speed, road conditions, and traffic density to minimize the risk of collisions.