Founded in 1971, Standards Testing Laboratories, also known as STL, is one of the largest and independent testing facilities for tires, wheels and related automotive components in the United States. It offers a range of static and physical, fleet and machine testing, photographic and consulting services to the rubber and automotive industries. It deals with product liability and vehicle handling tasks. The company s investigative sciences division focuses on transportation technologies and specializes in accident evaluation, failure analysis and other aspects of investigative testing. Its machinery division designs and manufactures instruments and computerized controls for modification, reconditioning, field servicing and machine calibration. Headquartered in San Angelo, Texas, STL s transportation testing division deals with vehicle fleet testing and tire traction.