The CrossBuck Sign shall have a design as shown in MUTCD R15-1. The sign shall be composed of two horizontal rectangular white signs placed one on top of the other at a 90-degree angle to form an "x," denoting a crossbuck. The width of each piece must be 9 inches, and the length must be 48 inches. In black letters, the word "RAILROAD" must be printed on the piece running from northwest to southeast, and the word "CROSSING" on the piece running from southwest to northeast. The lettering must be 7 inches high. The center of the X is to be at least 9 feet off the ground.