There are three main functional classes as defined by the United States Federal Highway Administration: arterial, collector, and local.
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 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.