Reference · road & bridge standards

Camber and Crossfall

Camber and crossfall are essential geometric features of road design that ensure surface water drains effectively from the carriageway.

Camber refers to the convex shape of a road surface, with the centre higher than the edges, while crossfall is the transverse slope applied to a single carriageway or one side of a dual carriageway. These slopes are critical for directing rainwater towards drainage systems, preventing ponding and improving skid resistance. The specific gradients are determined by factors such as road type, speed limit, and expected rainfall intensity.

Source: Design Manual for Roads and Bridges (DMRB), specifically CD 109 'Geometric Design of Single and Dual Carriageways'

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Last updated 2026-08-05. This is a living record — findings are added as dated entries and prior versions remain visible.