3M™ 983 Chevron Striping Reflective Tape is a very popular film for creating NFPA 1901 chevron stripes on Fire Trucks. It is a polycarbonate film so it has a long outdoor life. 983 is a stiffer film and it does not stretch or conform to unever surfaces, so it is perfect for flat surfaces such as the backs of fire trucks or the tail gates of trucks.
Oralite 983 Conspicuity Tape is incredibly bright, as you can see from the spec sheet below. This tape is not designed for signs, so it is not typed, however, if typed it would be equivelent to an ASTM D4956 Type 8 film. A specifications sheet for 3M 983 is below –
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3m-983-spec-sheet 
Steven Cole (Economics, MBA – University of West Florida , Business & Innovation – Stanford University) 25 years of experience in the reflective safety business. Specializing in vehicle accident and rear end collision reduction through increased visibility.