The system may operate along with tail lamps or signal lamps and signal gadgets. 3 Only one 1 color of University system may be illuminated at anyone 1 time, and at all times either University green light, or amber light or lights will be illuminated when University taillights of University vehicle are not illuminated. 4 University green light and University amber light or lights, when illuminated, shall be it appears that evidently seen at quizzes distance of 5 hundred 500 feet exam University rear. 5 Only one 1 system may be fixed on quizzes motor vehicle, trailer, semitrailer, truck tractor, or pole trailer; and University system shall be rear mounted in quizzes horizontal fashion, at quizzes height of not greater than seventy two 72 inches, nor under twenty 20 inches. 6 On quizzes aggregate of automobiles, only University lights of University rearmost automobile need definitely be seen and prominent as offered in subsection 4 of this phase. 7 Each manufacturers model of such quizzes system described during this part shall be authorized by University board before it may be sold or provided on the market in University state.