Built-up area (traffic management)

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The concept of a built-up area is used in the road traffic regulations of many countries to designate zones where additional restrictions apply due to the presence of dense roadside development and regular pedestrian activity. These areas are typically subject to reduced speed limits—often around 50 kilometres per hour (31 mph) or 30 miles per hour (48 km/h)—as well as additional controls, such as parking and noise. The primary aim of these regulations is to enhance road safety, reduce environmental impact, and protect the quality of life for those living or moving within such areas.

In some—but not all—jurisdictions employing the concept, a specific 'built-up area' sign is specified in the applicable regulations to inform road users of entry to and exit from a built-up areas in which different restrictions apply. This, for instance, exists in France and Germany, but not in the United Kingdom. Some countries may have similar signs indicating place names that have no regulatory purpose.

Other indicators of built-up area status are used; for instance, the United Kingdom delineates a status of 'restricted roads' on which a lower default speed limit applies based on the presence of street lighting.