Traffic Analysis Zones, Districts, and Sectors
The area MPO and TxDOT cooperatively develop traffic analysis zones (TAZs). TAZs are modified prior to each decennial census and may be modified during each travel model update when a new base year is established. Zones also may be modified between the base and the forecast years if anticipated development warrants change to the base year zone structure.
Subsequent to development of traffic analysis zones, TPP aggregates zones into districts and combines the districts into sectors. TPP geocodes and maps zones, districts, and sectors using TransCAD and provides maps to the MPO and local district office.