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Transportation Planning

Regional Traffic Count Program

NACOG is very excited to announce the implementation of a region-wide traffic count program to support and supplement current local traffic count programs. With funding from the Arizona Department of Transportation (ADOT), NACOG is conducting a three-year Regional Traffic Count Program by collecting data on federally classified roadways and local roads. This program helps to fill in the traffic count data gaps in our region, supports state and local planning decisions, and helps to inform and enhance local grant applications. 

Kimely-Horn Associates and sub-consultant United Civil Group will be gathering traffic count data from January 2021 to October 2023 on behalf of NACOG and its partner agencies. Our goal is to collect over 900 data points across the region to support local and statewide transportation planning, programs, and policies. 

Why is traffic count data important?
The collection of this data has many benefits to the region:

#1 NACOG is contributing to the statewide Highway Performance Monitoring System (HPMS) and FHWA’s Traffic Management and Analysis System. This data assists ADOT groups such as Roadway Design and the Multimodal Planning Division to plan and make decisions. Essentially, we are taking the pulse of the roadway so both ADOT and our Local Agencies can make informed decisions about expansion, preservation, and modernization of the roadways based on use. 

#2 NACOG has a good mix of federally classified and local roads in our count program. Traffic counts on local roads are not required to be collected or submitted (HPMS) but can offer additional benefits to our region such as:

  • Identifying existing traffic problems and solutions
  • Calculating pavement conditions
  • Defining crash rates
  • Projecting future roadway needs
  • Forecasting traffic volumes as it relates to new developments

Ultimately, having this data whether on a federally classified road or a local road, helps our communities identify needs, prioritize projects, and be more competitive in terms of securing federal and state grants. 

Phased Approach
The below table illustrates the jurisdictions that will be supported by the NACOG Traffic Count Program. It should be noted, however, that the count locations/jurisdictions will continue to evolve with this program and as the Transportation Technical Subcommittee (TSC) continues to prioritize locations. 

Phase 1 (2021)

Bagdad, Clarkdale, Camp Verde, Cottonwood, Holbrook, Jerome, Chino, Paulden, Page, Sedona, Oak Creek, Snowflake, St. Johns, Taylor, Tuba City, Williams, Winslow, White Mountains, Yavapai Co.

Phase 2 (2022)

Bureau of Indian Affairs, Navajo Co., Pinetop-Lakeside, Show Low, Springerville

Phase 3 (2023)

Apache Co., Eager, Navajo Co., Springerville, Winslow, Yavapai Co., Pinetop-Lakeside

The NACOG traffic count locations map demonstrates the traffic count locations across the region by each phase.

Locations will be prioritized by NACOG staff, its Transportation Technical Advisory Committee, and ADOT on an annual basis. Traffic count locations and the total number of counts may change.

The Technical Stuff
The NACOG Traffic Count Program will be following the Federal Highway Administration (FHWA) Traffic Monitoring Guide criteria for short duration traffic data collection:

  • 48-hour count (minimum count duration)
  • Typical weekday (Tuesday – Thursday)
  • Measure traffic volume (the number of vehicles driving on a particular road)
  • Collect vehicle classification (i.e., motorcycle, car, semi-truck)

This data is used to supplement ADOT’s continuous count data efforts. By using these criteria, NACOG is being consistent with current state and national reporting methods and is capturing traffic volumes and data that reflects the typical traffic in our communities.

If you have any questions or comments, please contact


ADOT Traffic Data Gap Map:

This map shows the traffic count data gaps for the state of Arizona. The NACOG region has nearly 1,200 miles of road with insufficient or missing traffic count data.

Traffic Data Management System:

ADOT requires that all collected traffic data counts be shared through the ADOT Traffic Count Database System (TCDS) Module. Here is a link to NACOG’s specific reporting portal: NACOG

Highway Performance Monitoring System (HPMS)

Annually, ADOT must submit statewide traffic count data to the Federal Highway Administration (FHWA) through the Highway Performance Monitoring System (HPMS). More information about ADOT’s HPMS is available here: 

United Civil Group (UCG) Traffic Data Collection Brochure. View the UCG brochure for more information on traffic count data, collecting data, and types of counts.