Transportation Code, Chapters 643, 645, 646, and 648 require the department to regulate motor carriers, leasing businesses, and motor transportation brokers in order to protect the welfare of the public and ensure fair treatment of consumers by household goods carriers. The sections under this chapter prescribe the policies and procedures for the regulation of motor carriers, leasing businesses, and transportation brokers by providing for insurance limits, the issuance of motor carrier credentials, the filing of performance bonds for transportation brokers, audit and record keeping functions, and enforcement.