Which of the following is a safe following distance?

A minimum of 3-4 seconds behind the vehicle in front is considered a safe following distance because it allows for ample reaction time in various driving conditions. This distance provides enough time to respond to sudden stops, emergencies, or changes in traffic. The 3-4 second rule is particularly effective in maintaining safety during inclement weather, heavy traffic, or when driving at higher speeds, where the stopping distance can be significantly increased.

In contrast to this option, the other approaches do not ensure adequate safety. A following distance of 1-2 seconds is often insufficient, especially at higher speeds or in situations where quick braking may be necessary. A maximum of 5 seconds behind might imply excessive distance, which can disrupt traffic fluidity. Lastly, following as closely as possible without hitting is inherently risky and could lead to rear-end collisions, particularly if the lead vehicle unexpectedly slows down or stops.