It shall be unlawful for any person to drive any motor vehicle or
other vehicle, trailer or tractor-trailer combination having a gross
weight in excess of 15,000 pounds upon any of the streets or portions
thereof in the Borough of Sharpsburg, provided that the provisions
of this section shall not apply to the driving of vehicles hauling
food or household goods, public utility vehicles, firefighting equipment,
garbage and rubbish vehicles, or school and public transportation
buses.