No motor vehicle or other vehicle shall be operated on the aircraft operating area, except by persons authorized by the airport operations manager. No motor vehicle or other vehicle except one having clearance from the airport operations manager shall be operated on or across runways or taxiways. Operators of such authorized vehicles shall be alert at all times and shall operate on runways and taxiways only as necessary in connection with work performed. All vehicles shall yield their right-of-way to aircraft. (I) (Ord. 3051 § 1, 1986)