California State Route 73
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| Maintained by Caltrans and TCA | ||||
| Length: | 17.764 mi (28.588 km) | |||
| Existed: | 1996 – present | |||
| Major junctions | ||||
| South end: |
 I-5 in Mission Viejo
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 SR 133 near Laguna Beach SR 55 in Costa Mesa
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| North end: |
 I-405 in Costa Mesa
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State Route 73 (SR 73) is a state highway in the U.S. state of California, running from the junction with Interstate 405 in Costa Mesa through the San Joaquin Hills to its junction with Interstate 5 in San Juan Capistrano, its northern and southern termini, respectively. The entirety of the route is located in Orange County. From its northern terminus, the first three miles (5 km) of the highway are called the Corona del Mar Freeway; this section of highway opened in 1978. The next 12 miles (19 km) of the 15-mile (24 km) highway, completed in November 1996, are a toll road operated by the San Joaquin Hills Transportation Corridor Agency named the San Joaquin Hills Transportation Corridor. Its alignment follows an approximately parallel path between the Pacific Coast Highway and the San Diego Freeway. There are no HOV lanes currently, but the medians have been designed with sufficient clearance for their construction should the need arise in the future.
State Route 73 is part of the California Freeway and Expressway System. SR 73 begins in San Juan Capistrano at an interchange with I-5. The freeway heads northwest into the city of Laguna Niguel before the tolled portion begins at the Greenfield Drive exit. SR 73 continues into the city of Aliso Viejo before entering Laguna Beach, where SR 73 intersects SR 133 with a separated-grade exit. Following this, the road passes through Crystal Cove State Park, where the main toll plazas are located. After leaving the state park, SR 73 straddles the border between Irvine and Newport Beach and provides easy access to University of California, Irvine through the Bison Avenue exit. Following the MacArthur Boulevard exit, the tolled part of the road ends. SR 73 continues into Newport Beach, running along the southern boundary of Orange County John Wayne Airport (IATA Airport Code SNA). Entering Costa Mesa, SR 73 interchanges with SR 55 before merging with I-405 and terminating the route.
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