A curb (US English), or kerb (British English), is the edge where a raised sidewalk, road median/central reservation, or road shoulder/hard shoulder meets an unraised pavement, street or other roadway.
Although curbs have been used throughout modern history, their widespread construction and use only began in the 18th century, as a part of the various movements towards city beautification that were attempted in the period.
A series of Paving Acts from the House of Commons of Great Britain during the 18th century, especially the 1766 Paving & Lighting Act, authorized the City of London Corporation to create foot-ways along all the streets of London, to pave them with Purbeck stone (the thoroughfare in the middle was generally cobblestone) and to raise them above the street level with curbs forming the separation. Previously, small wooden bollards had been put up to demarcate the area of the street for pedestrian use. The Corporation was also made responsible for the regular upkeep of the roads, including their cleaning and repair, for which they charged a tax from 1766.
Curbs perform a number of functions. They separate the road from the roadside, and discourage drivers from parking or driving on sidewalks and lawns. They provide structural support to the sidewalk edge. They channel runoff water from rain or melted snow and ice into storm drains. There is also an aesthetic aspect, in that curbs look formal and "finished".
Since curbs add to the cost of a road, they are generally limited to urban and suburban areas, and are rarely found in rural areas except where certain drainage conditions (such as mountains or culverts) make them necessary. Curbs are not universally used, however, even in urban settings (see living street).
In low-speed environments, curbs are effective at channeling motor vehicle traffic. On higher speed roads, curbs should not be used because they can destabilize vehicles that strike them. A high-speed vehicle that hits a curb may actually turn towards the sidewalk, rather than be directed away from it. A vehicle that strikes a curb can be tripped into a rollover crash or vaulted into the air. The vehicle could be vaulted over a traffic barrier into the object the barrier is intended to shield. This is a reason why they are rarely used on rural or high speed roads. Where curb is used with a traffic barrier, the barrier should be close to or well behind the curb to reduce the chances of a vehicle going over the barrier.
Depending on the area and the distance between the travel lane and the edge of pavement, an edge line can indicate the outside (shoulder) edge of the road . Retroreflective road marking material can also be applied to the curb itself to make it more conspicuous.
Types of curb
There are a number of types of curb, categorized by shape, material, height, and whether the curb is combined with a gutter. Most curb is constructed separately from the pavement, and the gutter is formed by the joint between the gutter and the curb. Combined curb and gutter (also called curb and channel) has a concrete curb and gutter cast together in one piece. Integral curb is curb constructed integrally as a part of a concrete pavement.
Curb often have a vertical or nearly-vertical face, also called barrier, non-mountable or insurmountable curb. Vertical-faced curb is used to discourage motor vehicle drivers from leaving the roadway. The square (90°-edge) or close-to-square type is still almost always used in towns and cities, as it is a straight step down and thus less likely to be tripped-over by pedestrians. Slope-faced curb allows vehicles to cross it at low speed. Slope-faced curb is most often used on major suburban thoroughfares. At driveways, crosswalks and other pedestrian crossings, dropped curb cuts are used to allow wheeled vehicles such as automobiles, wheelchairs, prams and strollers to cross it. This makes it easier to traverse for pedestrians, and especially for those in wheelchairs.
In Great Britain, high containment kerbs are used at locations with pedestrians, fuel station pumps, and other areas that need greater protection from vehicle traffic. These are 350 millimetres (14 in) high - much higher than standard curb, with a sloped lower portion and a concave face. These are also known as "Trief" or "Titan" curbs.
Rounded curbs are most often used at driveways, and continuously along suburban residential streets where there are many driveways and the sidewalk has a grassy setback from the street. This type starts out nearly flat like the road, curves up in a concave manner to a gentle slope, then curves back in a convex manner to nearly flat again, making it much easier to drive over, and is also known as a mountable curb in some localities.
Curbs are constructed of many materials, including asphalt, stone or masonry blocks, but most often are made of Portland cement concrete. The type of material may depend on the type of paving material used for the road and the desired function or need. For example, a Portland concrete curb used with an asphalt concrete pavement provides a highly visible barrier at the edge of the pavement. Other types of curb material include stone slab, cobblestone, and manufactured pavers.
Concrete curb may be constructed by setting forms by hand, filling them, letting them set up, and then removing the forms. When large quantities of curb are to be constructed, it is often more efficient to use a slip form casting machine. Curbs can also be precast at a central location and trucked to the construction site.
Asphalt curb is made with a paving machine. It can be cheaper if it is formed at the same time that a road is paved, but is less durable than concrete curb.
Stone curb, often made from granite, is durable and resistant to de-icing salt. It is also chosen for aesthetic reasons. In areas where granite is available, it may be cheaper than concrete curb. One disadvantage of granite curb is that it can cut a tire sidewall if it is rough-faced.
Belgian block curbs are made by placing blocks over a concrete slip. Then, concrete is wedged in between each block to hold them together. These blocks can be vertical or angled in order to create a mountable curb.
When designing a curbed roadway, engineers specify the reveal or lip. The reveal is the height of the section that is visible (revealed) above the pavement surface. Typical reveals are in the 4 to 8 inches (100 to 200 mm) range. Curbs at handicapped curb cuts (or "kerb ramps", for example in Australia) should have no reveal, although Americans with Disabilities Act guidelines permit up to 0.25 inches (6.4 mm) of vertical reveal.
Most curb extends down into the ground below the pavement surface. The total height, including the buried portion, is often 16 inches (410 mm).
Curbs with integral gutters are used where better hydraulic flow performance is needed. However, this places a longitudinal joint near where bicyclists often ride. If the pavement and gutter settle differently over time, the vertical edge that develops at the joint can cause a hazard for bicyclists.
Auto racing curbs
In auto racing, curbs are flat curbstones lining the corners or chicanes of racing tracks. They are often painted red and white, and are intended to prevent unauthorized short-cuts and keep the race safely on the track. Although they are not considered part of the racing track, drivers sometimes "ride the curbs" in order to maintain momentum and gain a time advantage in cornering.
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20.2 Drivers must use the track at all times. For the avoidance of doubt the white lines defining the track edges are considered to be part of the track but the kerbs are not.