On an open road, what is the recommended minimum following distance in seconds?

The recommended minimum following distance on an open road is four seconds. This guideline ensures that drivers have enough time to react to potential hazards and avoid collisions. Maintaining a four-second gap allows for a safe buffer, especially at higher speeds typically found on open roads. It provides adequate time for the driver to assess any unforeseen circumstances such as sudden stops by the vehicle in front or obstacles that may appear in the roadway.

A shorter following distance, such as two seconds, does not provide enough time for proper reaction to emergencies, while distances extending beyond four seconds could be excessive in many driving conditions. Therefore, the four-second rule strikes a balance between safety and maintaining a reasonable flow of traffic.