This tape is called Fl Yellow/ Green but it looks a bright Fluorescent Yellow
3M® DIAMOND GRADE TM CONSPICUITY MARKING TAPE: This extremely reflective adhesive tape is for trucks, trailers, and school buses and has an acrylic and polycarbonate construction designed to stand up to the rigors of the road and improve the visibility of trucks and trailers to approaching drivers.
3M® conspicuity markings are six times brighter than conventional markings, reflect at angles approaching 90 degrees, and are highly durable and non-corroding.
Federal regulations require semi-trailers exceeding 10,000 lbs. GVWR to have alternating red and white DOT-C2 approved 2-in wide conspicuity tape applied along at least 50% of their lengths and entirely across their back ends.
This tape is also great for horse trailers and RVs and is available in a variety of widths and lengths.
3M 983 conspicuity tapes are edge-sealed and warranted for 7 years
3M 983 in 6-inch wide red and fluorescent yellow-green colors for application to the backs of fire apparatus (trucks) according to NFPA 1901.