On August 8, 1996, the NHTSA printed a final rule requiring that truck tractors manufactured on or after July 1, 1997, be outfitted with purple-and-white retroreflective materials just like that required on the rear of the trailers they tow to increase nighttime conspicuity. Manufacturers may choose both retroreflective sheeting or reflex reflectors. Within the case of truck tractors delivered with a brief mudflap arrangement fairly than permanent gear, the requirement for retroreflective materials close to the highest of the mudflap could also be satisfied with materials carried by the momentary mudflap brackets which are transferable to the permanent mudflap system. Retroreflective material can be required close to the top of the cab in a sample much like that used on trailers. (This is a abstract of the regulation.
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The rear of each trailer and semitrailer have to be geared up with retro reflective sheeting (or reflex reflectors). Each strip of retro reflective sheeting (or reflex reflector) must be positioned as horizontally as practicable, extending across the full width of the trailer, starting and ending as close to the extreme edges as practicable. The centerline for each of the strips of retro reflective sheeting (or every reflex reflector) should be between 375 mm (15 inches) and 1,525 mm (60 inches) above the street floor when measured with the trailer empty or unladen, or as close as practicable to this area.
