When is it safe to pass another vehicle?

It is safe to pass another vehicle when the lane is clear without oncoming traffic. This condition ensures that there is enough space to execute the maneuver without risking a collision with vehicles approaching from the opposite direction. Passing requires careful judgment and assessment of the surrounding environment, particularly regarding visibility and traffic flow.

If the lane is clear, it indicates that there is no immediate danger from oncoming vehicles, which could create a hazardous situation. Moreover, visibility is crucial; drivers need to have a clear view of the road ahead to ensure that they can safely complete the pass without interruptions. This aligns with safe driving practices that prioritize safety and caution on the road.

Other options, while they involve aspects of the driving experience, do not necessarily guarantee safety when passing. Feeling comfortable is a subjective measure that doesn't take into account the actual road conditions, and speed limits are always a factor, but they alone do not imply it's safe to pass. Lastly, while a vehicle ahead signaling to change lanes can indicate their intention, it does not ensure that the road is clear for passing safely. Therefore, being sure the lane is clear without any oncoming traffic stands out as the essential criterion for safe passing.