Double frontage and reverse frontage lots are prohibited except where they are essential to provide separation of residential development from traffic arteries or to overcome specific disadvantages of topography and orientation. A planting screen easement of at least ten feet, across which there shall be no right of access, shall be provided along the line of lots abutting such a traffic artery or other disadvantageous use. The easement shall be planted with such species as are approved by the Park Development Committee.