Closed loop traffic signal control systems are a major design expertise of TEC. The firm has designed over 25 separate systems for communities ranging in size from 25,000 population to 650,000 population. Members of the firm have visited major equipment manufacturers plants and influenced software revisions. The expertise of the firm has been gained by hands on experience. Multiple field trips have been made to visit with agencies with operating systems to discuss operational problems.

Numerous computerized signal systems have been timed and field adjusted, using a variety of signal timing software packages. TEC has experience using Coptraflow, Synchro, Passer II, Passer III, Passer IV, Transyt 7-F, Teapac, and Soap. An area of interest to many agencies with existing UTCS systems is upgrades to the software. TEC can provide these services through specification writing.