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Materials and Tests Division - Conditions Collected and Rated

6601 Centennial Boulevard
Nashville, TN 37243 0360
phone (615)350-4167
fax (615) 350-4128

Asphalt Distress Types Evaluated in Tennessee


Photo of Fatigue Asphalt Distress.


Photo of Rutting Asphalt Distress.

Longitudinal Cracking in the Wheel Path

Photo of Longitudianl Cracking in the Wheel Path Asphalt Distress.


Photo of Patching/Potholes.

Block Cracking

Graphic showing Block Cracking.


Photo of Raveling Asphalt Distress.

Transverse Cracks

Photo of Transverse Cracks.

Longitudinal Cracks (Non-Wheel Path)

Photo of Longitudinal Cracks - Non Wheel Path.

Longitudinal Cracks In the Lane Joints

Photo of Longitudinal Cracks in the Lane Joints.

A description of how TDOT and its consultant rate these distresses is given in the document linked below.

Click here for TDOT Key Distresses & Criteria.

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.

Click here for the Distress Identification Manual.

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Smoothness Program in Tennessee

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.

A profiler with a laser!

It's a van