Unpaved road

An unpaved road is a type of road whose surface has not been sealed with a pavement treatment, such as concrete or bitumen. An unpaved road can be a dirt road, whose surface is the native material of the land surface (known as subgrade material), or it could be a gravel road, where the subgrade material has been covered by gravel but not sealed. There are approximately 13 million km (8.1 million mi) of unpaved road in the world, making up 57% of the total road length.

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