ORS 825.615: Preemption of local regulation of idling; exception.

(1) The authority to regulate the idling of primary engines in commercial vehicles is vested solely in the Legislative Assembly. A city, county or other local government may not enact any charter provision, ordinance, resolution or other provision regulating the idling of primary engines in commercial vehicles.

      (2) Notwithstanding subsection (1) of this section, a city, county or other local government may enforce any charter provision, ordinance, resolution or other provision regulating the idling of primary engines in commercial vehicles in effect on January 1, 2011.