The maximum density of 70 vehicles per gross acre may be achieved only if, in the Planning Board's opinion, the site can accommodate such density without resulting in adverse visual, traffic circulation, drainage, or other impacts. In making this evaluation, the Planning Board shall consider all relevant characteristics of the site and its setting, including, without limitation, the size and shape of the lot, the size and shape of the building, proposed vehicular circulation patterns, proposed storm drainage features and practices, existing and proposed vegetation, its depth and height in relation to adjacent roadways and adjacent properties, visibility from adjacent roadways and adjacent properties, the surrounding topography, and the type and extent of the lighting on the site.