Height. No freestanding sign shall exceed the maximum height of 15 feet except for billboards in the Limited Access Highway Proximity District and no attached sign shall be higher at any point than the roofline of the building. In addition, no attached sign shall project into or hang over a street right-of-way and no sign shall project beyond a building in a manner placing it above an area traversed by motor vehicles such as, but not limited to, driveway and parking areas.