A concrete curb and gutter is a pavement curb and roadway gutter cast together in one piece. They are mainly installed at the perimeter of a road or parking lot. The purpose of a concrete curb and gutter is to define the edges of a lot, holding the pavement in place and serving as a “termination” to prevent the pavement from expanding and deteriorating. In some cases, concrete curbs may also serve as barriers to prevent vehicles from running off the roadway. Curbs and gutters are also used to collect surface runoff from paved streets, parking lots, or other impervious surfaces and convey it to a storm drain system or appropriate treatment and/or infiltration system.