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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 for Arizona's Counties, Incorporated Places and Unincorporated Balance of Counties is available below:

July 1, 2017 Population Estimates 
July 1, 2015 Population Estimates 
July 1, 2014 Population Estimates 
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)

Starting with Calendar Year 2018, ADOT assumed the responsibility of collecting all HPMS data for the state, including HPMS data associated with local government roads. For more information involving ADOT’s HPMS program please click HERE


Functional Classification


Functional classification is the grouping of highways, roads and streets by the character of service they provide and was developed for transportation planning purposes. More detailed information about functional classification be found HERE.


In 2013/2014, SEAGO, along with our member agencies conducted a comprehensive review of the federal functional classification of all roadways in the region. To view the results of that effort, please click HERE.


 To view the Arizona Department of Transportation’s Functional Classification Maps, please click HERE: