On narrow mountain roads, drive as far to the right as possible and sound your horn when you cannot see at least ahead due to curves, hills, weather, or other obstacles.

200 feet

Explanation:

When driving on a narrow mountain road, it is advised a driver keeps as right as possible and horn when he can't see at least 200Feet ahead due to poor visibility.

Horning would help to reduce the risk of collision with an incoming vehicle, as the horn would alert the other driver of an approaching vehicle.

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the first plants to make the transition

explanation: