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Functional usage of a roadway is based upon its mobility and accessibility.

Travel can be logically related to the roadway's ability to access land and the mobility through an area.

Local facilities emphasize the land-access function. Arterials emphasize a high level of mobility for through movement.

Collectors offer a compromise between the two functions.

•    Mobility is measured in respect to ability of traffic to pass through a defined area in a reasonable amount of time.

• Common elements of mobility
   
  
  • Operating speed
  • Level of service
  • Riding comfort

•    Accessibility is measured in terms of the road system’s capability to provide access to and between land use
     activities within a defined area.

Relationship between traffic mobility and land use

     FHWA, 2008