This SAE Recommended Practice applies to retroreflective materials that are used on truck tractors and trailers 2032 mm or more in overall width and with a Gross Vehicle Weight Rating (GVWR) over 4536 kg, and school buses. The retroreflective materials for the truck tractors and trailers are super-high-intensity materials containing microprisms. The retroreflective materials for school buses may contain flexible non-exposed glass bead lens or microprisms.
The Heavy Duty Lighting Committee has completed the five year review of this document and has made the following changes. Updated SAE and ASTM publication titles Updated paragraph cross references in Section 6 Updated format of tables in 6.7 (aesthetic, no changes to requirements)