When can drivers safely tell a cyclist to pass?

Answer: D — Only when there are no cars nearby

The most appropriate scenario for a driver to safely tell a cyclist to pass is when there are no cars nearby. This ensures that there is a safe environment for the cyclist to maneuver without the risk of being startled or obstructed by other vehicles. Traffic conditions play a crucial role in ensuring safety when allowing cyclists to pass, as the presence of nearby cars can create hazardous situations. In a crowded or busy road, even if a driver indicates to a cyclist that it is safe to pass, the unpredictability of other vehicles could lead to accidents. Thus, the absence of nearby cars provides a safer context for cyclists to execute their pass without worries of sudden changes in traffic. This understanding of the situation reflects a well-practiced awareness of road safety and the dynamics of sharing the road with cyclists.