Except in A and R Zones, outdoor display of merchandise (other than vehicles and boats) is permitted up to ten (10) percent of the gross floor area of a commercial establishment. Such outdoor dis- play shall be located on the same lot as the main use or may be located on the adjoining municipal sidewalk only with the appropriate municipal permits and/or licenses. No additional parking shall be required for such additional area, provided existing parking is not reduced. The goods displayed shall be removed at the end of each business day. Outdoor display of vehicles and boats shall be permitted where the underlying use is permitted, provided that all other dimensional requirements of this ordinance are met.