In all residential and business districts R-1, R-2, R-3, B-1, B-2 and B-3, no person shall permit or cause the loading or unloading of any goods, wares or merchandise of any kind whatsoever from or upon any truck or vehicle to be parked for the purpose of loading or unloading during the hours between 10:00 p.m. and 6:00 a.m., Monday through Friday, and between 10:00 p.m. Saturday through 6:00 a.m. Monday, with the following exceptions:
1. Where any loading or unloading shall not require a vehicle to be parked in excess of five minutes.
2. Vehicles requiring freezer compressors or engine operation shall not operate such equipment for periods in excess of three hours per day, such periods to be between the hours specified above.
3. Where the Planning Board or Board of Adjustment has, prior hereto or hereafter, in particular cases effecting particular property, imposed greater restrictions than imposed herein, the greater restriction shall prevail.