Use and authority of certificate of registration.
Section 15
SEC. 15. Use and authority of certificate of registration.— The said certificate shall be preserved and carried in the car by the owner as evidence of the registration of the motor vehicle described therein, and shall be presented with subsequent applications for re-registration, transfer of ownership, or recording of encumbrances: Provided, That in lieu of the certificate of registration a true copy or photostat thereof may be carried in the motor vehicle. The certificate of registration issued under the provisions of this Act for any motor vehicle shall, while the same is valid and effective and has not been suspended or revoked, be the authority for the operation of such motor vehicle. No motor vehicle shall be operated on the public highways in a manner which would place it under a classification requiring the payment of a larger registration fee than that stated in the certificate of registration.