What is the purpose of the "3-second rule" in driving?

The "3-second rule" is primarily designed to help drivers maintain a safe following distance from the vehicle ahead. By counting three seconds between the time the vehicle in front of you passes a fixed point (like a sign or a tree) and the time your vehicle reaches the same point, you ensure that you have enough space to react in case the vehicle in front of you suddenly stops or slows down. This rule takes into consideration a safe buffer that allows for reaction time, increasing safety on the road, particularly in varying weather conditions and traffic situations.

This rule serves as a guideline to enhance visibility and maintain control of the vehicle. A longer following distance can be beneficial in adverse conditions, as it provides more time to respond to unexpected changes, thereby preventing collisions.