On a narrow stretch of road marked with a descent sign, it is hard to pass an oncoming vehicle because of an obstacle. Car A is going downhill, car B is going uphill. Which driver must give way?

Explanation

When passing is difficult on a downhill or uphill marked with road signs, the rules set a special priority rule: the driver going downhill must give way. That is because it is harder to stop and start again on an uphill.