6.6.1 General. In a Limited Industrial District and in an Industrial District where a lot
6.6.1 General. In a Limited Industrial District and in an Industrial District where a lot used for a purpose not permitted in any Residential District abuts or extends into a Residential District, or abuts another lot which has frontage only in a Residential District or which extends from a Residential District into a Limited Industrial District or an Industrial District by less than fifty (50) feet, there shall be provided a "Greenbelt" along the particular portions of the lot which are next to such Residential District or such abutting lot. Such "Greenbelt" shall consist of an area of not less than twenty-five (25) feet in width containing a dense planting of trees and shrubs to provide within such area a -42- natural barrier between the lot and the adjacent premises having an effective height of not less than seven (7) feet; provided that if the Board of Appeals determines that such "Greenbelt" will create a traffic hazard it may grant an exception to the requirements of this paragraph to the extent it determines is necessary to alleviate such traffic hazard.