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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. ==Route description== Starting at Finley Avenue on Newport Boulevard in Newport Beach, south of SR 1, SR 55 (Newport Boulevard) is a four-lane expressway for approximately 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.〔 North of Fair Drive, SR 55 is an at-grade or above-grade freeway, with the exception of a stretch between the 1st Street/4th Street exit and the 17th Street exit in Santa Ana, which is below-grade. SR 55 intersects SR 73 and I-405 next to John Wayne Airport. The freeway continues north into Santa Ana and Tustin, where there is an interchange with I-5. The southbound side of the Costa Mesa Freeway does not have a direct link to northbound I-5.〔 SR 55 continues north into Orange, where it meets the eastern terminus of SR 22. Following this, the freeway continues almost due north until turning northeast to merge with SR 91 eastbound, and intersecting ramps for SR 91 westbound near the Santa Ana River. Today, SR 55 is a heavily-travelled corridor linking southern Orange County with SR 91, the main corridor between the Inland Empire and the Los Angeles Metropolitan Area, as well as I-5, the main north–south corridor for California. A HOV lane has been built along the entire route, with its own off- and on-ramps, including one for I-5. However, congestion is still very prevalent throughout the day, as is the norm with many Orange County freeways; Route 55 experiences a peak daily traffic volume of 262,000 vehicles and 17,292 trucks.〔 SR 55 is part of the California Freeway and Expressway System〔(【引用サイトリンク】title=Streets and Highways Code Section 250–257 )〕 and the National Highway System,〔 a network of roadways important to the country's economy, defense, and mobility. SR 55 from SR 91 to Costa Mesa is known as the Costa Mesa Freeway, as named by Assembly Concurrent Resolution 177, Chapter 86 in 1976. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「California State Route 55」の詳細全文を読む スポンサード リンク
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