No person shall drive or operate any taxicab within the city unless there is first filed with the City Recorder a policy of public liability insurance issued by a company licensed to conduct business in this state attesting that such insurance company will assume responsibility for injuries to person or property caused by the operation of the taxicab in the amounts indicated by ORS 30.270 unless specifically exempted. Such policy of insurance shall contain a provision against cancellation except upon thirty day’s prior written notice to the city. (Ord. 1624, 1989; Ord. 1516, 1982; Ord. 1439, 1978)