In which scenario should a driver not attempt to overtake another vehicle?

A driver should not attempt to overtake another vehicle when an oncoming vehicle is approaching due to the significant safety risks involved. Overtaking in such a scenario can lead to a head-on collision, which is one of the most dangerous types of accidents. The driver may not have enough space or time to complete the maneuver safely before the oncoming vehicle arrives, which can result in severe consequences for all parties involved.

In contrast, the other scenarios have specific factors that could make overtaking more feasible. For instance, overtaking while driving downhill could increase speed, making it dangerous but not inherently unsafe if conditions permit. Waiting at a stoplight typically means vehicles are stationary, and overtaking is unnecessary. A wide road may provide enough space and visibility for an overtaking maneuver, reducing risks associated with limited space.