MTA, one of the largest public transportation agencies in the United States, provides more than 75% of all public transit services in Los Angeles County. It operates the Metro Bus System, which consists of more than 2,000 peak hour buses that serve a 1,433 square mile area. MTA also operates the 73-mile Metro Rail System, which includes the Metro Red Line subway and the Metro Gold, Blue and Green light rail lines. As the region's primary transportation planner and programmer, MTA also funds such programs as paratransit services, bikeways, street and freeway improvements and the Metro Freeway Service Patrol. Metrolink is Southern California's regional commuter rail service and is in its eleventh year of operations. The Southern California Regional Rail Authority, a joint powers authority made up of an 11-member board representing the transportation commissions of Los Angeles, Orange, Riverside, San Bernardino and Ventura counties, governs the service. Metrolink continues to be one of the nation's fastest growing commuter rail services, operating over seven routes through a six-county network with 512 total route miles.