Colorado Revised Statutes Title 40. Utilities § 40-10.1-206. Rates--limitations

(1) It is unlawful for any common carrier to carry or advertise that it will carry any individuals at rates different from those it has on file with the commission for such carriage.

(2) A contract carrier shall not destroy or impair, through discrimination or unfair competition, the service or business of any common carrier or the integrity of the state's regulation of any such service or business; and to that end, the commission is authorized and directed to prescribe minimum rates, fares, and charges to be collected by contract carriers when competing with duly authorized common carriers, which rates, fares, and charges must not be less than the rates prescribed for common carriers for substantially the same or similar service.

(3) In accordance with this article and such rules as the commission may prescribe, every contract carrier subject to this article shall file with the commission, within such time and in such form as the commission may designate, and shall keep on file with the commission, at all times, schedules showing rates, charges, and collections, collected or enforced or to be collected or enforced, that in any manner affect or relate to the operations of any such contract carrier; and the commission has full power to change, amend, or alter any such tariff or, after hearing, fix the rates of any contract carrier subject to this article that competes with a common carrier.