Functional classification

The functional classification of a road is the class or group of roads to which the road belongs. There are three main functional classes as defined by the United States Federal Highway Administration: arterial, collector, and local.

Arterial roads
Main article: Arterial road

Arterial roads generally provide the fastest method of travel and typically have low accessibility from neighboring roads. They are usually designed with long-distance travel in mind and are not as common as the other two functional classes of roads. They are also called Highway

Collector roads
Main article: Collector road

Collector roads are the second most common and are used as a connection between local roads and arterial roads. They provide a balance between access and mobility.

Local roads

Local roads are the most common roads by far, but are also the slowest for travel. They are designed specifically to have high accessibility and to connect to collector and arterial roads, and are typically not used for through traffic. The main function of local roads are to allow for people who live in low density residential to connect to other residential areas or to collector roads.

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