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Cross section of a road: main road situated outside towns and cities.
Platform: horizontal surface raised above the surrounding ground.
Shoulder: space between the roadway and the ditch.
Median strip: separation between two roadway.
Carriageway: central part reserved for vehicle traffic.
Ditch: channel that carries away water.
Subgrade: upper surface of a road.
Base course: middle surface of a road.
Subbase: lower surface of a road.

Vegetal biology
Animal biology
Humain Body

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