Kerbs

Kerbs, known in American English as curbs, are raised edges that run along the sides of roads, pavements, and pedestrian zones. They provide a physical boundary between vehicular lanes and pedestrians, help retain paving materials, and channel rainwater into drainage systems. By defining the road’s cross-section, kerbs also contribute to street geometry and safety by restricting vehicle encroachment into sidewalks and by guiding wheel paths.

Kerbs are produced in a variety of materials and profiles. Common choices include concrete and natural stones such as granite or limestone, often arranged as modular units or continuous cast elements. Profiles range from square-edged to bull-nosed or mountable variants, which allow vehicles to cross the edge at low speed. In many cities, kerbing is integrated with a drainage channel or a kerb and channel system.

Installation and maintenance vary with climate and traffic. Kerbs are laid on bedding material and tied into the pavement or drainage system; damaged kerbs are repaired by replacement or reconstruction of the affected units. The choice of kerb type and color can also convey functional information, such as bus lanes, cycle tracks, or accessibility considerations for wheelchairs and pedestrians.