Why should a driver avoid passing another vehicle when the speed difference is slight?

Choosing to avoid passing another vehicle when the speed difference is slight is primarily about maintaining smooth traffic flow and safety. When a driver attempts to pass another vehicle and the speed difference is minimal, it can lead to unnecessary congestion. Vehicles that are traveling at similar speeds can create a situation where traffic starts to bunch up behind the slower vehicle. This can increase frustration among drivers and may lead to unsafe driving behaviors as those behind may feel compelled to attempt risky maneuvers to overtake the slower vehicle.

In slow-moving and congested conditions, it's often more prudent to maintain one's lane and adapt to the traffic rather than create additional complications by passing another vehicle with minimal speed gain. This approach promotes a more stable and predictable driving environment, thereby enhancing overall road safety.