If two vehicles of similar size meet on a hill, which one has the right of way?

The vehicle going downhill has the right of way when two vehicles of similar size meet on a hill. This rule is based on the principle of control and momentum. A vehicle going downhill has more gravitational force acting on it, making it more difficult to stop or maneuver than a vehicle traveling uphill. As a result, the downhill vehicle may have less ability to yield or change course without risking a loss of control.

In practical terms, this regulation helps prevent accidents in hilly or steep areas. Uphill vehicles may have more traction and control at lower speeds and can often find a place to safely stop and yield for downhill traffic. Hence, the driver going downhill must be granted right of way to ensure safety and smooth traffic flow on inclines.