Data and Analysis

Average Annual Daily Traffic (AADT)

The annualized average 24-hour volume of vehicles at a given point or section of highway is called a traffic count. It is normally calculated by determining the volume of vehicles during a given period and dividing that number by the number of days in that period.

How We Obtain Traffic Counts
Automatic Traffic Recorder (ATRs)

The ATRs collect data 24 hours a day, 365 days annually, for each lane. The equipment records traffic volumes, speed and classification of vehicles. MPD uses this data to develop seasonal factors, daily factors, axle factors and estimate vehicle miles of travel (VMT). These factors are applied to all coverage counts.

Coverage Counts

Coverage counts are needed to ensure that adequate geographic coverage exists for all roads under the jurisdiction of the state highway authority. In simple terms, coverage counts are data collection efforts that are undertaken to ensure that at least some data exist for all roads maintained by the agency.

AADT Reports: Traffic Counts

This data is also available in the Traffic Data Management System.

2015 AADTs (includes K, D and T factors) - Interstates (PDF)
2015 AADTs (includes K, D and T factors) - US Routes (PDF)
2015 AADTs (includes K, D and T factors) - State Routes (PDF)
2015 AADTs (includes K, D and T factors) (Excel)

2014 AADTs (includes K, D and T factors) - Aggregate (PDF)
2014 AADTs (includes K, D and T factors) - Interstates (PDF)
2014 AADTs (includes K, D and T factors) - US Routes (PDF)
2014 AADTs (includes K, D and T factors) - State Routes (PDF)
2014 AADTs (includes K, D and T factors) - Data Dictionary (PDF)
2014 AADTs (includes K, D and T factors) - FHWA Vehicle Class  (PDF)
2014 AADTs (includes K, D and T factors) (Excel)

2013 AADTs (includes K, D and T factors) - Aggregate (PDF)
2013 AADTs (includes K, D and T factors) - Interstates (PDF)
2013 AADTs (includes K, D and T factors) - US Routes (PDF)
2013 AADTs (includes K, D and T factors) - State Routes (PDF)
2013 AADTs (includes K, D and T factors) - Data Dictionary (PDF)
2013 AADTs (includes K, D and T factors) (Excel)

2012 AADTs (includes K, D and T factors) 
2012 AADTs (includes K, D and T factors) - Interstates (PDF)
2012 AADTs (includes K, D and T factors) - State Routes (PDF)
2012 AADTs (includes K, D and T factors) - US Routes (PDF)

2011 AADTs (includes K, D and T factors) (Excel) 

2010 AADTs (includes K, D and T factors) (Excel) 

2008-2009 (uses previous K, D and T factors) (Excel)
2008-2009 (uses previous K, D and T factors) (PDF)

2007-2009 AADTs (Excel)
2007-2009 AADTs (PDF) 

Forecast
2030 Forecast AADTs (Excel) 
References

AADT Data Dictionary
This dictionary defines the column headings and code values used in these files.

Traffic Projection Data Dictionary:
This dictionary defines the column headings and code values used in these files.

K, D and T Factor Data Dictionary
This dictionary defines the measurements and column headings used in these files.

Location ID and Mileposts

Basic Instructions for Transportation Data System Management (TDMS):
This is a brief description of the basic search methods for TDMS
Contact Us

For more information regarding traffic volumes, please contact the Traffic Monitoring Office:

Mark Catchpole
Multimodal Planning Division
Transportation Analysis Section
Phone: 602.712.8596
Fax: 602.252.8313

Civil RightsTitle VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA)

Pursuant to Title VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA), ADOT does not discriminate on the basis of race, color, national origin, age, sex or disability. Persons that require a reasonable accommodation based on language or disability should contact ADOT’s Civil Rights Office at 602.712.8946 or at [email protected]. Requests should be made as early as possible to ensure the State has an opportunity to address the accommodation.

De acuerdo con el título VI de la Ley de Derechos Civiles de 1964 y la Ley de Estadounidenses con Discapacidades (ADA por sus siglas en inglés), el Departamento de Transporte de Arizona (ADOT por sus siglas en inglés) no discrimina por raza, color, nacionalidad, edad, género o discapacidad.  Personas que requieren asistencia (dentro de lo razonable) ya sea por el idioma o por discapacidad deben ponerse en contacto con la Oficina de Derechos Civiles al 602.712.8946 o en [email protected]. Las solicitudes deben hacerse lo más pronto posible para asegurar que el equipo encargado del proyecto tenga la oportunidad de hacer los arreglos necesarios.