This dataset contains geospatial point data showing historical Annual Average Daily Traffic (AADT), Classification AADTs for all 13 FHWA classes, calculation methods for all AADTs, the Truck Percentage, and the TN-TIMES link for the station.

The Calculation Method for the AADT indicates whether the Annual Average Daily Traffic was created directly from a raw count or if it calculated based on an alternate methodology:

Actual – The AADT is based on an actual raw count from the given year.

Grown – The AADT was grown from the previous year AADT based on the average growth rate of the county. AADTs calculated using this methodology have a superscript value 3 in TN-TIMES.

Combined – The AADT was combined from two separate directional AADTs. Please refer to TN-TIMES for the directional AADT methodology. AADTs calculated using this methodology have a superscript value 7 in TN-TIMES.

Doubled – The AADT was doubled from only one directional AADT. Please refer to TN-TIMES for the directional AADT methodology. AADTs calculated using this methodology have a superscript value 12 in TN-TIMES.

Balanced – The AADT was calculated from corridor balancing. Corridor balancing is a method that relies on a start node on an interstate and adds and subtracts subsequent ramp volumes to calculate additional AADTs along the mainline. AADTs calculated using this methodology have a superscript value 8 in TN-TIMES.

Virtual – The AADT was calculated based on a combination of related station AADTs. Please refer to TN-TIMES for the specific stations involved. AADTs calculated using this methodology have a superscript value 19 in TN-TIMES.

The Calculation Method for the Class AADTs similarly indicates the source data for the value:

Actual – The Class AADT is based on a raw class count collected at the station in the given year.

Distributed – The Class AADTs are based on the average class distribution of the base stations that are in the same Class Distribution Group. The group assignment for the given station can be found in TN-TIMES.

Derived – The Class AADTs are based on a combination of length data from the given station and the class distribution. Actual Class AADTs and Distributed Class AADTs are based on axle class counts rather than length counts.

This dataset is updated annually.