What rule should you follow to maintain a safe following distance when operating a bus, truck, or truck/tract and semi-trailer?

To maintain a safe following distance while operating a bus, truck, or truck/tractor with a semi-trailer, following the 5-second rule is essential. This rule allows for ample space between your vehicle and the one in front of you, accommodating the increased stopping distance required due to the significant weight and size of heavy vehicles.

A 5-second following distance provides the driver with sufficient time to react to sudden stops or emergencies, reducing the risk of collisions. Heavy vehicles have longer braking distances than lighter vehicles, making it crucial to maintain this greater space. By counting the seconds between the moment the vehicle in front passes a stationary object and the moment your vehicle passes the same object, you can accurately gauge your distance. This practice enhances safety, especially in varying weather conditions or traffic situations.

In contrast, shorter following distances such as 1 second, 3 seconds, or even 4 seconds may not allow enough reaction time and could lead to dangerous situations, especially with heavier loads where stopping quickly is more challenging. Thus, adhering to the 5-second rule is integral to defensive driving for larger vehicles.