Car park

A car park is a designated area or building where cars and other vehicles can be parked and left temporarily. In the United States, it is referred to as a ‘parking lot’. Car parks are a common feature of the built environment, and often adjoin shopping centres, public buildings, schools, sports and entertainment venues, and so on.

There are different types of car park, and the design will be dependent on the required use, location, available space, potential revenue, security requirements, and so on. Some of the most common types of car park include:

Typically, car parks are an area with a durable or semi-durable surface. As the surface is often impervious, car parks can result in water pollution due to limited or no facilities that are capable of handling water run-off.

Depending on the floor area of the relevant building or facility requiring a car park, or the number of occupants, there may be a minimum number of parking spaces required by the planning permission.

Parking space measurements will differ according to layouts, e.g. parallel, herringbone, in-line, but standard specifications are as follows:

Car: 2.4 m x 4.8 m.
Light vans: 2.4 m x 5.5 m.
Rigid vehicles: 3.5 m x 14.0 m.
Articulated vehicles: 3.5 m x 18.5 m.
Coaches (60 seats): 3.5 m x 14.0 m.

Car parks should be designed with a boundary that is clearly-defined so that members of the public know that it is a private space. Clear demarcation, i.e. painted lines and signs, should be used to direct drivers and pedestrians to designated routes and to make them aware of any conditions of use, such as charges and penalties.

Boundary features that can be incorporated include:

Hedges, dense vegetation, grass verge, flower beds, ditches.
High or low retaining walls.
Fencing or railings.
Barriers.
Bollards.
Natural features, e.g. river, trees.
Other buildings or structures.

Many car parks use boom gates to allow or prevent access which are activated either manually by a cashier in a booth, or by the car driver presenting or taking a ticket. More modern car parks can feature technology that checks the duration of stay, allows the location of vehicles, finds empty spaces, and so on.

Some car parks operate on a pay-and-display system, in which a ticket is purchased from a cashier or ticket machine and displayed in the vehicle’s front window. Parking enforcement officers then check for compliance.

It is common for entry and exit routes to a car park to be situated close together, although larger car parks may require more than one point of entry/exit. Height restrictors may be necessary to control the type of vehicles that use the facility. Where there is open access at ground floor level, security measures should be designed to prevent unauthorised access.

Vehicular flow around a car park can be controlled by techniques such as; staffed control points, CCTV, barrier access, flow points, passive or active signage and so on. Signage should be designed so that it is clearly visible and used to control, instruct or warn users. Signs are typically used to indicate entry and exit routes, one-way lane directions, the location of pay booths/machines, toilet facilities, lift/staircases, emergency help points, and so on.