Who regulates trucking companies in Texas?

If the trucking company conducts business intrastate – meaning only within the state of Texas, regulations from the Texas Department of Transportation (TxDOT) apply. If the trucking company conducts business interstate – meaning in more than one state, then regulations from both the Texas Department of Transportation (TxDOT) and the Federal Motor Carrier Safety Administration (FMCSA) apply. Whether intrastate or interstate, a trucking company must first obtain operating authority from the Federal Motor Carrier Safety Administration (FMCSA) and have a U.S. Department of Transportation (U.S. DOT) number.