Cross-sectional Elements:

The terms used in the cross-section of a road are :

Carriageway

The portion where traffic moves.

Shoulder

The portion outside the carriageway to provide lateral support to the pavement and for giving working space for stopped vehicles.

Kerb

A vertical or sloping member along the edge of a pavement provided for supporting raised footpaths or central median.

Median

A central reverse for providing space separating dual carriageways.

Chamber

Also known as cross-slope for facilitating drainage.

Side Slope

Slopes of embankment or cutting.

Roadway Width

Total top width of a road.

Formation Width

Total width of a road at the level of the bottom of the pavement. Sometimes, the roadway width itself is known as the formation width.