When two vehicles approach a narrowing road where safe passing is not possible, which vehicle must yield?

In situations where two vehicles encounter a narrowing road and safe passing is not possible, the general rule is that the vehicle facing downhill should yield to the vehicle facing uphill. This is primarily because vehicles traveling downhill have a greater tendency to gain speed, making it more difficult to stop or maneuver. Additionally, when on a slope, a vehicle going uphill may have more difficulty starting again if it has to come to a stop, whereas the downhill vehicle can reverse easily or back up to allow the other vehicle to pass safely.

This concept is based on the inherent control challenges presented by the incline. Uphill gradients require more effort for vehicles to climb, and by yielding, the downhill vehicle allows the uphill vehicle to proceed, reducing the risk of accidents and ensuring safer navigation through the narrowed road section.

Understanding this rule helps drivers anticipate and respond appropriately in mountainous or controlled driving environments where road conditions may require additional caution and cooperation among drivers.