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Question:

When vehicles meet on a steep, narrow road that is not wide enough for two vehicles, the vehicle going downhill

A must yield the right-of-way to the vehicle going uphill.
Explaination

When vehicles meet on a steep, narrow road that is not wide enough for two vehicles, the vehicle going downhill must yield the right-of-way. It must stop at, or back up to, a wider place to leave sufficient space for the vehicle going uphill, unless it is more practical for the vehicle going uphill to return to a wider space.