Off-street loading. On the same premises with every
building, structure or part thereof erected and occupied for commercial,
industrial, institutional or other uses similarly involving the receipt
or distribution of vehicles, materials or merchandise, there shall
be provided and maintained on the lot adequate space for off-street
standing, turning, loading and unloading services in order to avoid
interference with the public use of the streets, sidewalks and other
public rights-of-way.