Founded in 1973 by U.S. Army Veteran Thomas Gast, Truck Driver Institute (TDI) is an adult vocational school that trains individuals and couples to get their Commercial Driver License (CDL). Our school has grown to 11 campuses located in eight states, and is the largest Class A CDL School East of the Rockies not owned by a trucking company. We provide ourselves on being able to provide ongoing job placement* with our more than 20+ carrier partners.