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.

View our interactive Traffic Database Map

2018 AADTs (includes K, D and T factors) - Interstates (PDF)
2018 AADTs (includes K, D and T factors) - US Routes (PDF)
2018 AADTs (includes K, D and T factors) - State Routes (PDF)
2018 AADTs (includes K, D and T factors) (Excel)

2017 AADTs (includes K, D and T factors) - Interstates (PDF)
2017 AADTs (includes K, D and T factors) - US Routes (PDF)
2017 AADTs (includes K, D and T factors) - State Routes (PDF)
2017 AADTs (includes K, D and T factors) (Excel)

2016 AADTs (includes K, D and T factors) - Interstates (PDF)
2016 AADTs (includes K, D and T factors) - US Routes (PDF)
2016 AADTs (includes K, D and T factors) - State Routes (PDF)
2016 AADTs (includes K, D and T factors) (Excel)

2015 AADTs (includes K, D and T factors) (Excel)

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) (Excel)

References
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:

Traffic Monitoring Section
Phone: 602.712.8232
Fax: 602.252.8313

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