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Traffic and Population Data

Traffic Data Management System

This program enables you to search SEAGO's traffic count database and generate printable, easy-to-read traffic count reports.

Our Traffic Data Management System (TDMS) is the central repository for local traffic counts within the SEAGO region. Traffic counts stored in this database were collected and provided to SEAGO by our local jurisdictions and by consultants specializing in traffic data collection. The Traffic Data Management System is updated immediately when an agency uploads a recent count to the system. Each count was taken during a continuous 24-hour period, beginning on the date indicated. Counts longer than 24 hours were divided into distinct 24-hour intervals and stored in the database as separate records.

Population Data

Another major role of SEAGO's Transportation Section is the collection of population data for growth projections for the region. Population data is available below:

July 1, 2015 Population Estimates for Arizona Counties, Incorporated Places, and Balance of County
July 1, 2014 Population Estimates for Arizona Counties, Incorporated Places, and Balance of County
Arizona Office of Employment & Population Statistics state and county population projections for 2015-2050
Us Census Bureau National Population Projections (2014-2060). These projections are the first based on the 2010 Census.

Another valuable resource for state demographics is the Maricopa Association of Governments' interactive State Demographic Map Viewer.

Highway Performance Monitoring System (HPMS)

SEAGO provides a variety of information for its member entities and for the Arizona Department of Transportation. Some of this information is in the form of required federal reports to the Federal Highways Administration that SEAGO compiles and submits to ADOT on behalf of its members. The major source of information is the annual Highway Performance Monitoring System (HPMS) report. While ADOT and the FHWA sill want all data required for Federal HPMS reporting, ADOT has requested that the COGs concentrate their efforts on seven items. The data to be collected and reported through this system includes:


  • Name of road and termini
  • Jurisdiction responsible for maintenance
  • Segment length (miles)
  • Functional class
  • Number of lanes
  • Type of surface
  • Traffic count
  • AADT
  • Raw count and month/date collected


Once all of the changes have been incorporated into the data set, the information will be reviewed by the ADOT Data Bureau staff. If there are any questions or additional information is needed, Data Bureau staff will contact the COG/MPO. To view a listing of SEAGO's 2010 HPMS functionally classified roads click HERE.


To view the SEAGO Region 2012 HPMS Certified Mileage Report, click HERE.


To download a presentation involving the functional classification process, click HERE.