When driving downhill, who should yield to whom if both vehicles are on a slope?

The principle behind yielding when driving downhill is based on safety and control of the vehicles involved. When a vehicle is going downhill, it has more momentum and is generally harder to stop than a vehicle traveling uphill, which is more likely to be moving at a slower speed or even at a stop.

Therefore, the correct answer indicates that the downhill vehicle should yield to the uphill vehicle. This is to prevent any potential accidents or loss of control that might happen if the downhill vehicle were to collide with an uphill vehicle that is attempting to pass or maneuver. Uphill vehicles are usually given the right of way because they are in a more vulnerable position and have the greater challenge to maintain movement or regain speed after stopping.

In scenarios where both vehicles are on slopes, accommodating the uphill vehicle is a safe practice to ensure that the dynamics of gravity and vehicle control are managed responsibly.