“Emergency vehicle.” “Emergency vehicle” means a vehicle that is equipped with lights and sirens as required under ORS 820.350 and 820.370 and that is any of the following

(1) Operated by public police, fire or airport security agencies.

(2) Designated as an emergency vehicle by a federal agency.

(3) Designated as an emergency vehicle by the Director of Transportation. [1983 c.338 §43; 1993 c.751 §5]