Where a lot or parcel of ground used for business purposes in the BP district abuts, or adjoins across a street (adjoining across a limited access highway is excluded), a residentially zoned or used parcel, a greenbelt or lawn area with a minimum width of thirty (30) feet shall be provided along the abutting or adjoining property line. A planting screen, consisting of suitable shrubbery and/or a berm, shall be installed at the time of construction of, or conversion to, a business activity and shall be maintained in order to provide effective screening at all times during the year. The shrubbery and/or berm may be planted informally or in rows and shall screen parking areas, outside storage areas, loading berths, trash and refuse containers from abutting and adjoining residential zoned or used parcels. Vision clearance on corner lots and at the intersections of streets and driveways shall be observed and maintained. No accessory buildings or uses may be erected within the required greenbelt or lawn area with the exception of sidewalks, decorative or protective items, other landscaping items and signage. Additional landscaping such as street trees may be required by the Plan Commission in order to maintain area-wide uniformity. Landscaping shall comply with the requirements of article XII and a landscape plan shall be submitted concurrent with the site plan.