The AADT file is a station point location of Annual Average Daily Traffic (AADT) estimates. This includes the data submitted to FHWA for Highway Performance Monitoring System (HPMS) AADT reporting for 2021. Data are reported for AADT on all highways with a Functional Classification (FC) above Local. A full coverage is provided for these routes where AADT segmentation is based on network configuration, travel patterns, and land use. The extent of highway this AADT represents has not been determined. 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. There are over 44,000 AADT stations that provide traffic data history from 2002 to the current year. With these collection locations, Traffic Survey has adopted the following data collection schedule: Interstate route volumes are collected on an annual basis; US and NC route volumes are also collected on an annual basis except for stations that 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. The following urban areas are collected during the even year cycle: Asheville, Charlotte, Concord-Kannapolis, Fayetteville, Gastonia, Goldsboro, Greenville, and Jacksonville. The following urban areas are collected during the odd year cycle: Burlington, Chapel Hill, Durham, Greensboro, Hickory, High Point, Raleigh, Rocky Mount, Wilmington, and Winston-Salem. Data in this file derives from NCDOT Roads & Highways, Quarter 1 publication of the current calendar year. The referencing provided is based on the 2022 Quarter1publication of the NCDOT Linear Referencing System (LRS). Some differences will be found when using different quarterly publications with this data set. The data provided is seasonally factored to an estimate of an annual average of daily traffic. The statistics provided are Location_ID - 10-digit unique count location identifier, ROUTE: Numbered route identifier, or local name if not State maintained, LOCATION: Description of the Annual Average Daily Traffic station location.

AADT 2021: Estimated Annual Average Daily Traffic in vehicles per day for 2021 AADT_2018: Estimated Annual Average Daily Traffic in vehicles per day for 2018 AADT_2017: Estimated Annual Average Daily Traffic in vehicles per day for 2017 AADT_2016: Estimated Annual Average Daily Traffic in vehicles per day for 2016 AADT_2015: Estimated Annual Average Daily Traffic in vehicles per day for 2015 AADT_2014: Estimated Annual Average Daily Traffic in vehicles per day for 2014 AADT_2013: Estimated Annual Average Daily Traffic in vehicles per day for 2013 AADT_2012: Estimated Annual Average Daily Traffic in vehicles per day for 2012 AADT_2011: Estimated Annual Average Daily Traffic in vehicles per day for 2011 AADT_2010: Estimated Annual Average Daily Traffic in vehicles per day for 2010 AADT_2009: Estimated Annual Average Daily Traffic in vehicles per day for 2009 AADT_2008: Estimated Annual Average Daily Traffic in vehicles per day for 2008 AADT_2007: Estimated Annual Average Daily Traffic in vehicles per day for 2007 AADT_2006: Estimated Annual Average Daily Traffic in vehicles per day for 2006 AADT_2005: Estimated Annual Average Daily Traffic in vehicles per day for 2005 AADT_2004: Estimated Annual Average Daily Traffic in vehicles per day for 2004 AADT_2003: Estimated Annual Average Daily Traffic in vehicles per day for 2003 AADT_2002: Estimated Annual Average Daily Traffic in vehicles per day for 2002 Note: A value of zero in the AADT field indicates no available AADT data for that year. Please note the following: Not ALL roads have PTC stations located on them. Except for Interstate, NC and US routes, NCDOT County Maps refer to roads using a four-digit Secondary Road Number, not a road’s local name. If additional information is needed, or an issue with the data is identified, please contact the Traffic Survey Group at (919) 707-0936. Disclaimer related to the spatial accuracy of this file: This data cannot be construed to be a legal document.