How are MPOs and TMAs established or altered?
MPOs and TMA boundaries are roughly determined using data gathered during the diennial census. The most critical piece of information is the urbanized area (UZA) designation, which indicates the presence of an urban core with 1000 people per square mile or more. This core area is included with outlying areas with more than 500 people per square mile to create the urbanized area boundary. If the urbanized area has a total population of more than 50,000, it is designated as a Metropolitan Planning Area (MPA). A Metropolitan Planning Organization is created to perform transportation planning and federal funding allocation within the MPA. The Governor of the state determines the final MPO boundary, and outlying areas with low population density can be included in the MPO. A Transportation Management Aarea (TMA) is established when an MPA exceeds a population of 200,000.
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