This code is intended only for the inspection and maintenance of lighting equipment on motor vehicles that are in use. The original SAE code, adopted in 1937, was drafted for use in preparing Interstate Commerce Commission regulations for trucks and buses in interstate operation under the 1935 Motor-Carrier Act. Subsequently, the SAE code served as a basis for Section 2, Lighting Systems, of the American National Standard Code for Inspection Requirements for Motor Vehicles, ANSI D7-1939. The ANSI inspection requirements for lighting systems were adopted by the Society as the SAE Recommended Practice in January 1940.