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State Route 75 is a 13-mile (21 km) expressway in San Diego County, California. It is a loop route of Interstate 5 that begins near Imperial Beach, heading west on Palm Avenue. The route continues north along the Silver Strand, a thin strip of land bordering San Diego Bay, through Silver Strand State Beach. SR 75 passes through the city of Coronado as Orange Avenue (pictured) and continues onto the San Diego–Coronado Bay Bridge over the bay, before joining back with Interstate 5 near downtown San Diego at a freeway interchange. Orange Avenue dates from the late 19th century, and the Silver Strand Highway was open to the public by 1924. What would become SR 75 was added to the state highway system in 1933 and designated Legislative Route 199 in 1935. SR 75 was not officially designated until the 1964 state highway renumbering. The Coronado Bay Bridge opened in 1969, providing a direct connection between San Diego and Coronado. SR 75 is marked as a scenic route for nearly its entire length. (Full article...)