ORS 815.145: Exemptions from traction tire or chains requirement.

(1) This section establishes exemptions from ORS 815.140 and 815.142.

      (2) The following are completely or partially exempt as described:

      (a) Police vehicles under any conditions.

      (b) Fire vehicles when responding to a fire.

      (c) An ambulance when responding to an emergency.

      (3) A passenger vehicle or truck is not required to use chains if the vehicle or truck:

      (a) Has an unloaded weight of 6,500 pounds or less;

      (b) Is equipped and operated to provide power to both front and rear wheels;

      (c) Is carrying chains as defined in ORS 815.045;

      (d) Is equipped with tires, on all wheels, that are vehicle traction tires as defined in ORS 815.045;

      (e) Is not towing another vehicle other than as may be necessary to remove disabled vehicles from the roadway; and

      (f) Is not being operated in a manner or under conditions where the vehicle loses traction while stopping, cornering or moving.