Mission & What We Do
The Traffic Survey Group is the primary traffic data provider for the North Carolina Department
of Transportation. It is the Group’s mission to provide statewide coverage of quality traffic
data using innovative analysis and traffic data collection methods to support the planning, design, construction, maintenance, operation, and research activities required to manage the transportation system in North Carolina.
The following NCDOT - Traffic Survey Products have been updated or added to the Product Links box
- The AADT Stations ArcGIS point shapefile layer (2012 UPDATE)
- The AADT Stations Description Document (2012 UPDATE)
- The 2012 Interstate & Freeway Report (2012 UPDATE)
- The 2012 AADT Traffic Volume Excel & PDF Reports (2012 UPDATE)
- The 2012 AADT & Vehicle Class (VC) Segments shapefile layer (2012 coming soon)
- The 2012 AADT & Vehicle Class (VC) Segments Description Document (2012 coming soon)
- FHWA & North Carolina Vehicle Classification Schema relationship (Utilize this document when viewing the AADT & VC Segment data.)
Annual Average Daily Traffic (AADT) Traffic Volume Map
An AADT is an Annual Average Daily Traffic volume for all lanes in both directions
passing a point on the highway system. It represents the average of all days during the
year with typical traffic conditions. An AADT estimate is generated using procedures
that comply with the standards specified in the Traffic Monitoring Guide published by the
Federal Highway Administration.
With more than 40,000 Portable Traffic Count (PTC) Stations located throughout North Carolina,
Traffic Survey has adopted the following data collection schedule:
- Interstate route volumes are collected on an annual basis with the exception of stations which fall within the off cycle urban areas. (See urban area cycle below) *Reference county maps for the most current Interstate data within off cycle urban area. (Off cycle means the year in which data will not be collected.) *Reference urban maps for the most current Interstate data within on cycle urban area. (On cycle means the year in which data will be collected.)
- US and NC route volumes are also collected on an annual basis with the exception of stations which fall within the off cycle urban areas. (see urban area cycle below)
- Secondary Road (SR) volumes are collected on a biennial cycle with approximately half being counted each year. If a particular secondary road is not available for the most current year, it may be available for the prior year.
- North Carolina’s eighteen largest urban areas are counted on a biennial cycle with 10 urban areas counted during the even years and 8 urban areas counted during the odd years.
- Urban Area Cycle (even year): Asheville, Charlotte, Concord-Kannapolis, Fayetteville, Gastonia, Goldsboro, Greenville, Jacksonville
- Urban Area Cycle (odd year): Burlington, Chapel Hill, Durham, Greensboro, Hickory, High Point, Raleigh, Rocky Mount, Wilmington, Winston-Salem
The AADT maps are published once the data for the entire state has been collected, analyzed and processed. Publication typically occurs towards the later part of the summer.
The AADT maps are most readily available online as pdf images of the County or Urban area. (See Product Links)
Please note the following:
- Not ALL roads have PTC stations located on them.
- With the exception of Interstate, NC and US routes, NCDOT County Maps refer to roads using a four digit Secondary Road Number, not a road’s local name.
- To find the secondary road number with the road’s local name or to find the road’s local name with the
secondary road number, use The Secondary Roads Database Lookup. This database will
provide a cross-index of the Road Name and the Secondary Road number. Be sure to first select the
County when searching the location of a secondary road number
Annual Average Daily Traffic (AADT) Traffic Volume Maps Shape File
All data is provided in ArcGIS format and are readily viewed using ArcView or ArcMap
software. More information about this software and data format can be found
Disclaimer related to the spatial accuracy of this file:
The data in this file was digitized referencing the available NCDOT GIS Data Layer, LRS Arcs Shapefile Format from Quarter 1 release and is not the result of using GPS equipment in the field. The North Carolina Department of Transportation shall not be held liable for any errors in this data. This includes errors of omission, commission, errors concerning the content of the data, and the relative positional accuracy of the data. This data cannot be construed to be a legal document.
Traffic Data Request
We encourage our customers to use our online AADT maps or our AADT reports found in the Product Links box. Using these resources will enable our customers to receive AADT data when they need it. However, if you still need the assistance of our office, please contact our Traffic Data Request Line.
When requesting traffic data, please provide the following information: (see example below)
- County in which the request is located
- City or Town (if applicable) in which the request is located
- Nearest intersecting road to the request location
- Wake County
- City of Raleigh
- I-440 (location of the count request)
- SR 1005 - Six Forks Rd (nearest intersecting road)
Please do not use an address, block number, distance or GPS when describing location.
Traffic Monitoring Programs:
The Traffic Survey Group (TSG) Organizes traffic monitoring activities based on the model provided by the Traffic Monitoring Guide (TMG) published by the Federal Highway Administration (FHWA). Activities are coordinated under the following three programs:
A Spatial Editing and Validation Process for Short Count Traffic Data
A research project that investigates spatial techniques to validate short-term traffic counts within an automated quality control process.
Prototype Demonstration of a Geographic Information System Application for the Seasonal Analysis of Traffic Data, Development of Seasonal Factors and Seasonal Adjustment of Roadways
A method for updating seasonal groups for traffic count locations using an ArcView Geographical Information System application.
||Traffic Data Request Line
- E-Mail - Contact Us
- Phone during office hours: 8:00 a.m. - 5:00 p.m.
- Fax : 919-773-2935
- Mail / Courier - 1547 Mail Service Center, Raleigh NC, 27699-1547
- Delivery - 750 N. Greenfield Parkway, Garner NC, 27529
- E-Mail - Contact Us
- Phone during office hours:
8:00 a.m. - 5:00 p.m.
Toll Free: 1-877-DOT-4YOU