Dirt road is a common term for
unpaved roads made from the native material of the land surface through which they pass, known to highway engineers as
subgrade material. Unpaved roads with a harder surface made by the addition of material such as
gravel and
aggregate (stones), might be referred to as dirt roads in common usage but are distinguished as improved roads by highway engineers. (Improved unpaved roads include
gravel roads, laterite roads, murram roads and
macadamized roads).
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