You'll have to be more specific. Africa is a huge continent and there are sand or dirt roads everywhere.
which mineral is the main component of sand
How many grains of sand are there on the planet?
Bulk bags are most commonly used for rainstorms and floods. In these types of situations, the bulk bags are known as sand bags. Using sand bags helps for residents and roads to not flood.
Utah uses salt, sand, and liquid ice-melt on the roads during winter.
Salt melts ice, sand improves tires grip on the road
the main source of beach sand is canyons.
because it just is
sand gravel, asphalt, pavement, concrete, and rebar
to increase friction
Ice is slick; sand is not. Sand spread over the ice and snow make it less likely that cars will slide uncontrollably and get into accidents.
Salt or a mixture of salt and sand is typically placed on roads when it snows to melt the ice and improve traction for vehicles. Sand alone can also be used to increase traction on icy roads.