Where this happens regularly you will see a sign warning of 'ensablement'.
In places like the photo above, JCBs are often used to dig out the accumulated sand on the windward side and carry it across the road, rather than let nature drift it across.
The bigger problem is grit and gravel on bends everywhere in Morocco, especially after rainfall has brought it down from higher up.
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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