What is the basis of the '2 second rule'?

The basis of the '2 second rule' is to maintain a safe following distance while driving. By staying at least 2 seconds behind the vehicle in front of you, you are allowing yourself ample time to react to sudden stops or emergencies that may occur. This rule is a guideline for drivers to gauge their distance from the car ahead; it involves counting the seconds it takes for the rear of that vehicle to pass a fixed point after the front of your vehicle passes the same point. This method helps prevent tailgating, reduces the risk of collisions, and enhances overall road safety.

The other options do not align with the fundamental purpose of the '2 second rule.' Counting to 2 while braking is not a standard practice, keeping headlights on for 2 seconds is not relevant to safe following distance, and checking mirrors every 2 seconds does not pertain to maintaining space between vehicles. Thus, the effective practice is established through the 2 second rule, emphasizing safe spacing and reaction time on the road.