The streets, or parts thereof, described in appendix I, section 125, hereby incorporated herein, are hereby designated as freight loading and unloading zones, and no person shall stop, stand or park a vehicle therein during the hours of 8:00 a.m. to 6:00 p.m. for any purpose other than the expeditious loading or unloading of freight, equipment, or other goods and then only for a period not to exceed one (1) hour.