All passenger automobiles and all trucks owned by the City of
Buffalo and used by the various departments thereof shall hereafter
bear an inscription on the front door panel on both sides of each
such automobile and on both sides of the cab of each such truck, containing
the words "CITY OF BUFFALO, FOR OFFICIAL USE ONLY."
This chapter shall not apply to such vehicles used by the Fire
and Police Departments which bear distinctive colorings and markings
identifying such vehicles; nor shall this chapter apply to any automobile
used by the Mayor, the Comptroller, the President of the Council or
the Commissioner of Police or to such vehicles as the Commissioner
of Police designates for police purposes.