Tennessee Department of Transportation
John Schroer, Commissioner

Asphalt Distress Types Evaluated in Tennessee

The above document was based on the "Distress Identification Manual" established for the LTPP program by the FHWA.  Tennessee has modified its criteria and ratings based on the opinions of the Pavement Management User group that was established for the purpose of improving the effectiveness of the Pavement Management System.  Below is a link to this Manual.

The Tennessee DOT uses a consultant to collect its Smoothness and Distress data every year on a network level.  TDOT does however have its own profilers and smoothness program that it uses for project level purposes and warranty jobs.  TDOT has five profilers spread through the state.  One for each of the four regions in Tennessee and one Headquarters profiler that is used on a variety of projects, as well as, TDOT's QA/QC program.  TDOT collects both Half-Car IRI and Quarter-Car IRI for its smoothness program.