Operating large commercial motor vehicles requires specialized skills and training that must be learned. A CDL is a professional license permitting the holder of the license to drive those large commercial vehicles and buses on public roadways in Texas and in the United States. This license demonstrates that you have been trained, tested, and are qualified to safely operate large commercial motor vehicles.
Single License Requirement:
It is illegal for a person who operates a commercial motor vehicle to have more than one driver’s license at any time.
Single License Requirement, 49 CFR 383.21
Texas Transportation Code Sec 521.026