(1) The governing body of an incorporated city shall not designate a truck route or prohibit the operation of any vehicle on a:
(a) State highway that is within the boundaries of the city without the written consent of the Department of Transportation.
(b) County road that is within the boundaries of the city without the written consent of the governing body of the county.
(2) Any designation or prohibition made under authority of this section must be imposed by appropriate order, resolution or ordinance.
(3) A road authority exercising authority under this section shall erect and maintain signs in a conspicuous manner and place at each end of the highway or section of highway where a designation or prohibition is imposed to give notice of the prohibitions or designations imposed. The road authority shall erect and maintain signs giving notice of any prohibitions or designations imposed under this section at such other places as may be necessary to inform the public.
(4) A prohibition or designation imposed under this section is effective when signs giving notice thereof are posted as required by this section.
(5) Penalties are provided under ORS 811.450 for violation of requirements imposed under this section. [1983 c.338 §148]