No charter party carrier of passengers shall operate any motor vehicle on any public highway unless there is displayed on the vehicle a distinctive identifying symbol in the form prescribed by the commission, showing the classification to which the carrier belongs. No such identifying symbol shall be displayed on any vehicle until a permit or certificate of public convenience and necessity under this chapter has been issued to the carrier. The identifying symbol displayed by charter party carriers subject to the Interstate Commerce Commission shall serve in lieu of the display requirements of this section.
