State Route 76 (SR 76) is a state highway long in the U.S. state of California. It is a much used east–west route in the North County region of San Diego County that begins in Oceanside near Interstate 5 (I-5) and continues east. The highway is a major route through the region, passing through the community of Bonsall and providing access to Fallbrook. East of the junction with I-15, SR 76 goes through Pala and Pauma Valley before terminating at SR 79. A route along the corridor has existed since the early 20th century, as has the bridge over the San Luis Rey River near Bonsall. The route was added to the state highway system in 1933, and was officially designated by the California State Legislature as SR 76 in the 1964 state highway renumbering. The section of the highway through Oceanside and Bonsall is mostly a four-lane expressway; east of I-15, the roadway is mostly a two-lane highway. Originally, the entire highway was two lanes wide; west of Bonsall, the route was widened in stages, after decades of funding shortages, planning, and litigation. The California Department of Transportation (Caltrans) maintained plans to expand the entire length of the highway west of I-15 to an expressway, and as of May 2017, construction between Bonsall and I-15 was complete. Route description The roadway carrying the SR 76 designation begins at County Route S21 (CR S21) in Oceanside, although Caltrans does not consider the road west of I-5 to be part of the route, and it is not in the legal definition. There is soon an interchange with I-5, after which SR 76 becomes a four-lane expressway known as the San Luis Rey Mission Expressway. From I-5 to Mission Avenue, the highway parallels the San Luis Rey River until it passes by the Oceanside Municipal Airport. During this stretch, SR 76 intersects Loretta Street, Canyon Drive, Benet Road, Airport Road, and Foussat Road. There are two overpasses: one over Mission Avenue, and one over El Camino Real, before the road intersects Douglas Drive, the main road to the San Luis Rey gate of Camp Pendleton. After an intersection with Rancho Del Oro Road, SR 76 passes over Mission Avenue again before intersecting with Old Grove Road, Frazee Road, a turnoff into the Towne Center North shopping center, and College Boulevard. As it enters rural Oceanside, SR 76 intersects with North Santa Fe