It shall be unlawful for any person to stop, stand, or park a vehicle other than a bus in a bus stop, or other than a taxicab in a taxicab stand, except that the driver of a passenger vehicle may temporarily stop therein for the purpose of and while actually engaged in loading or unloading passengers when the stopping does not interfere with any bus or taxicab waiting to enter or about to enter the zone.
('79 Code, § 8-27) Penalty, see § 70.99