Annotation of standard text SAE J682 :
For guidance only in regard to highway commercial motor vehicles where protection to the rear against rear wheel splash and stone throw is deemed necessary, the following clearance specifications are recommended.
SUBJECT TAXONOMY: Tires and traction, Wheels, Driveshafts, Vehicles, Trucks, Buses
SUBFILE: Commercial Vehicle
TYPE OF DOCUMENT: Ground Vehicle Standard
Stabilized: May 2011 