Vehicles parked in violation of the provisions of Section 6.40.170 of this code may be removed when signs have been posted providing for the removal of vehicles illegally parked. Such signs authorizing the removal of illegally parked vehicles shall be placed in the following instances:
(a) On those streets where parking is prohibited during the alteration, repair or improvement of any highway and appropriate signs have been posted;
(b) On those streets where parking has been prohibited during the holding of public or private assemblages, gatherings or functions and appropriate signs have been posted.
(Ord. 412 § 1, 1977)