A curb (or kerb in British spelling) is the raised edge that separates the roadway from the sidewalk, boulevard, or adjacent property. Curbs serve multiple functions: they define the road boundary for drivers, contain stormwater and direct it to drains, protect pedestrians on sidewalks, and prevent vehicles from driving onto adjacent areas. Curbs can be constructed from concrete, asphalt, granite, or other materials. Modern curb design includes accessibility features like curb cuts or ramps at intersections for wheelchair users, strollers, and cyclists. Municipalities maintain curbs as part of road infrastructure, and curb replacement often accompanies road reconstruction projects. The area between curb and property line is typically called the boulevard.