MTS Bus is a department operated by Metropolitan Transit System, which was established in 1975 as the Metropolitan Transit Development Board. Metropolitan Transit System, also known as MTS, is a bus and rail service providing agency that serves more than 3 million people across over 3200 square miles in San Diego County. The agency offers light rail services through its affiliate company San Diego Trolley. Metropolitan Transit System and its partner company San Diego Transit Corporation operate approximately 80 fixed-bus routes to provide bus transit services. It provides planning, scheduling and performance monitoring of transit services. The agency receives funding from various federal, state and local sources, including the California Transportation Development Act. It offers monthly pass programs to provide affordable public transportation services. The agency s Taxicab Administration department licenses and regulates taxicabs, nonemergency medical and sightseeing vehicles, jitneys, charter cabs and low speed vehicles. It also operates planning, joint development, security, MTS Trolley, marketing and customer service departments. Metropolitan Transit System is located in San Diego.