What is the formula for determining following distance?

The correct formula for determining following distance is the 3 Second Rule. This guideline helps drivers safely assess how far behind another vehicle they should be, particularly in emergency situations. By counting "one thousand one, one thousand two, one thousand three" after the vehicle ahead passes a fixed point (like a roadside sign), a driver can determine if they are maintaining an adequate distance. This three-second interval provides enough time to react if the vehicle in front suddenly stops or slows down, thus enhancing safety on the road.

A shorter following distance, such as in the 1 Second Rule, doesn't provide enough reaction time, especially for emergency vehicles that may need to make quick maneuvers. The 2 Second Rule, while better than the 1 Second Rule, may still not afford sufficient time, particularly at higher speeds. The 4 Second Rule could provide extra safety but could be excessive in many normal driving conditions. Therefore, the 3 Second Rule strikes an appropriate balance between safety and practicality when determining following distance.