Transition requirement. There shall be established along the line of any lot that is contiguous to any residential district, unless the lot line coincides with a state or federal highway, a buffer area as defined and regulated in this chapter at least 25 feet in width, plus five feet of additional width for each ten-foot interval or fraction thereof of the building height of the principal building. The buffer area shall be landscaped, and fencing shall be provided as required to provide appropriate screening of the lot adjoining the residential districts, and further provided that no access driveway shall be connected to Bloomfield Avenue.