TMA, MPO and COG
The ADOT, MPO, and COG Guidelines and Procedures Manual is intended to be a resource document to assist in outlining the guidelines and procedures to conduct regional transportation planning functions and programs administered by the ADOT Multimodal Planning Division.
A TMA is designated by the U.S. Secretary of Transportation for an urbanized area with a population of at least 200,000. Congress provided for this greater role by MPOs through a certification review aimed at formalizing the continuing oversight and day-to-day evaluation of the planning process.
An MPO is a governmental entity required in urban areas with a population of 50,000 persons or more. The MPO is charged with providing a comprehensive regional transportation planning process for the designated planning area.
A COG is a regional body with voluntary membership that provides a forum for regional transportation planning, collaboration, and decision making in regions comprising several counties with a total contiguously urbanized population of less than 50,000.