No person shall stop, stand or park a vehicle other than a bus in a bus stop, or other than a taxicab in a taxicab stand, when any such stop or stand has been officially designated and appropriately signed; provided, 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 such stopping does not interfere with any bus or taxicab waiting to enter or about to enter such zones; provided further, that the parking of motor vehicles is authorized in that half of the existing bus loading zones located nearest the regular parking areas on Kansas Avenue between Sixth and Tenth Streets from the hours of 6:30 p.m. until 9:30 p.m. of each day. (Code 1981 § 43-498. Code 1995 § 142-504.)