One freestanding, on-site, commercial sign shall be permitted before each development proposed on property abating the right-of-way of a major highway, such as Route 13. Said sign shall not be higher than 30 feet or lower than 14 feet above ground and shall be limited in surface area to 100 square feet. No part of the freestanding, on-site, commercial sign shall be closer than 20 feet from any property line. Additional on-site, freestanding signs may be permitted by the Commission and may be limited in size, height, and location at its discretion, but may not exceed the requirements stated herein.