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truth is many mountain strips are "one way" runways with slope.
normal runways are "two way" and fairly flat allowing aircraft to take off into the prevailing wind to get lift faster and become airborne with a shorter ground run.
and the runway in use will be according to current wind conditions.
but there are many one way strips in primitive or mountain areas where pilots land on the upslope to allow getting the airplane stopped before the end, and take off in the opposite direction to allow a fast buildup of speed to get off the ground fast. due to topography these runways are usually shorter than normal and use the slope specifically to assist getting the plane stopped when landing, or airborne when flying out in the opposite direction.
and this kind of runway can be used regardless of wind direction due to the slope.
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