Costa Mesa Freeway
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State Route 55 highlighted in red
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| Route information | ||||
| Defined by | ||||
| Maintained by Caltrans | ||||
| Length: | 17.807 mi (28.658 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: | Finley Avenue in Newport Beach | |||
 SR 1 in Newport Beach SR 73 in Costa Mesa I-405 in Costa Mesa I-5 in Tustin SR 22 near Orange
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| North end: |
 SR 91 in Anaheim
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State Route 55 (SR 55) is an 18-mile (30-km) long north–south highway in the U.S. state of California. The portion of the route built to freeway standards is known as the Costa Mesa Freeway (formerly the Newport Freeway). SR 55 runs between Finley Avenue south of Pacific Coast Highway (SR 1) in Newport Beach and the Riverside Freeway (SR 91) in Anaheim to the north, intersecting other major Orange County freeways such as SR 22, SR 73, and Interstate 405 (I-405). The freeway passes through suburban Orange County.
SR 55 was first added to the state highway system in 1931, known as part of Legislative Route 43, and was routed on surface streets. It was renumbered SR 55 in 1959, and the construction of the freeway portion began in the 1960s and continued until 1992. Due to congestion, several alternatives are being discussed to expand the freeway portion past its current end in Newport Beach. SR 55 received the first carpool lane in Orange County in 1985, and the first direct carpool ramp in 1995.
Starting at Finley Avenue on Newport Boulevard in Newport Beach, 0.3 miles (0.48 km) south of SR 1, SR 55 (Newport Boulevard) is a four-lane expressway for approximately 0.75 miles (1.21 km) to its intersection with 17th Street in Costa Mesa. It then follows a traditional street routing through a retail and commercial section of Costa Mesa until its intersection with 19th Street. The segment on Newport Boulevard includes a limited-access interchange at SR 1. Following the 19th Street intersection, SR 55 becomes an eight-lane below-grade freeway that bisects the northbound and southbound lanes of Newport Boulevard until the Mesa Drive undercrossing.
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