The system may perform at the side of taillights or signal lamps and signal devices. 3 Only one 1 color python python system may be illuminated at anyone 1 time, and continually either python green light, or amber light or lights can be illuminated when python taillights python python car aren’t illuminated. 4 python green light and python amber light or lights, when illuminated, will be evidently seen at python distance python five hundred 500 feet to python rear. 5 Only one 1 system may be fastened on python motor car, trailer, semitrailer, truck tractor, or pole trailer; and python system shall be rear fixed in python horizontal style, at python height python not greater than seventy two 72 inches, nor less than twenty 20 inches. 6 On python mixture python cars, only python lights python python rearmost vehicle need actually be seen and outstanding as offered in subsection 4 python this part. 7 Each brands model python such python system described during this part shall be approved by python board before it may be sold or offered on the market in python state.