route of the namesake California State Route 91. Limited weekend service began in July 2014. On June 6, 2016, service was extended beyond Riverside to Moreno Valley and Perris–South station in Perris. OC Streetcar , OCTA is collaborating with the cities of Santa Ana and Garden Grove to build the OC Streetcar, a , 12-station light rail line along Santa Ana Boulevard and 4th Street in the two cities, using portions of the West Santa Ana Branch of the old Pacific Electric right-of-way. The western terminus of the proposed route would follow the Pacific Electric right-of-way near the intersection of Harbor Boulevard and Westminster Avenue in Garden Grove, then along street running track on Santa Ana Boulevard into Downtown Santa Ana, where it would reach the Santa Ana Regional Transportation Center at its eastern terminus. In February 2016, $125 million towards the project was included in the proposed United States federal budget for the 2016-17 fiscal year. OCTA began construction in 2018 and plans to open the project in 2023. Cancelled CenterLine light rail The CenterLine was a proposed light rail system serving Irvine, Costa Mesa and Santa Ana. It was originally planned in the 1990s and was intended to open in 2009. Costing $1 billion, it was originally envisioned as a route that would run from Fullerton to Irvine, through Anaheim, Orange, Santa Ana and Costa Mesa. The route would have served destinations including John Wayne Airport, South Coast Metro, South Coast Plaza, Santa Ana College and downtown Santa Ana. While OCTA secured funding through Measure M, lack of support from Orange County's congressional representatives resulted in no federal funds obtained for the proposed transit line. In February 2005, the CenterLine was suspended indefinitely, and in May 2005, the plan was officially scrapped in favor of expanding express bus service throughout Orange County and improving existing Metrolink commuter rail service. Highway and road operations OCTA is responsible for the Countywide Master Highway Plan, which designates major arterial streets in the county, however, all road maintenance responsibilities fall with the city where the street operates in, or with the county, in the case of unincorporated areas. OCTA street funding is steered towards roadways on the Master Plan in recognition of their role in regional travel. Recent projects West County Connectors: In June 2010, OCTA broke ground on the West County Connectors project. The $328 million project is Orange County's largest