(a) The commission is hereby authorized to require annual, periodical or special reports from all motor carriers, to prescribe the manner and form in which such reports shall be made and to require from such carrier specific answers to all questions upon which the commission may deem information to be necessary. Such reports shall be under oath whenever the commission so requires. The commission may also require any motor vehicle carrier to file with it a true copy of each or any contract, agreement or arrangement between such carrier and any other carrier or person in relation to any traffic affected by the provisions of this chapter, to which he or it may be a party.

(b) The commission may, in its discretion, prescribe the forms of any and all accounts, records and memoranda to be kept by motor carriers and the length of time such accounts, records and memoranda shall be preserved, including the accounts, records and memoranda of the movement of traffic, as well as of the receipts and expenditures of money. The commission or its duly authorized agents shall at all times have access to all lands, buildings or equipment of motor carriers used in connection with intrastate operations and also all accounts, records and memoranda, including all documents, papers and correspondence now or hereafter existing and kept, or required to be kept, by motor carriers. The agents of the commission shall have authority under its order to inspect and examine any and all such lands, buildings, equipment, accounts, records and memoranda, including all documents, papers and correspondence now or hereafter existing and kept or required to be kept by such carriers; this provision shall apply to receivers of carriers and to operating trustees and, to the extent deemed necessary by the commission, to persons having control, directly or indirectly, over or affiliated with any motor carriers.

(c) As used in this section, the term "motor carrier" includes brokers.