The University of Tennessee, Knoxville


TSA Instructors

Airton G. Kohls, Ph.D.

CTR signal lab
Dr. Kohls is a Research Associate at the University of Tennessee's Center for Transportation Research. He holds B.S., M.S. and Ph.D. degrees in Civil Engineering from the University of Tennessee. He has 10 years practical experience in Traffic Engineering with both public and private agencies. Dr. Kohls has served as an Adjunct Assistant Professor with the University of Tennessee Department of Civil Engineering, teaching Traffic Engineering Operations.

Bill D. Medley

Mr. Medley is the Vice-President of Progression Electric, a provider of traffic signal installation and maintenance in East Tennessee. He has over thirty years of experience as a traffic signal technician and currently is a project manager responsible for new traffic signal installations, maintenance, and modernization projects. Mr. Medley is a graduate from Tennessee Technological University and is a specialist in trouble-shooting problems with traffic signal equipment and systems.



The University of Tennessee, Knoxville. Big Orange. Big Ideas.

Knoxville, Tennessee 37996 | 865-974-1000
The flagship campus of the University of Tennessee System