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|direction_b=East |terminus_b=El Cajon city limit |previous_type=SR |previous_route=53 |next_type=SR |next_route=55 |counties=San Diego }} State Route 54 (SR 54) is a state highway in San Diego, California that connects Interstate 5 (I-5) in Chula Vista and National City to the city of El Cajon. The westernmost part of the highway is a freeway, intersecting with I-5, I-805, and SR 125; the part of the highway east of SR 125 is undivided, and portions are maintained by the county. The first section of the freeway opened in 1963, east of I-805. The extension of the freeway west to I-5 was delayed because a flood channel for the Sweetwater River was built with the extension. While construction started in 1984, a court stopped the process for a few years, and this portion was not complete until 1992. The final section of freeway, which was upgraded from an expressway, opened in 2007, to coincide with the extension of SR 125 south to Otay Mesa. ==Route description== SR 54 starts as a six-lane freeway from I-5 at the mouth of the Sweetwater River in National City, with westbound traffic traversing the north bank of the river and eastbound traffic traversing the south bank. Both sides join near the junction with I-805, and the roadway continues east for several miles through Paradise Hills in San Diego. As the freeway turns north, it merges with SR 125 north, and SR 54 exits at Jamacha Boulevard in La Presa. The routing follows Jamacha Boulevard as an undivided highway northeast through Spring Valley until reaching Campo Road, although some maps only sign Jamacha Boulevard as County Route S17 (CR S17), and the state does not maintain this portion of the route.〔〔〔 SR 54 then runs concurrently with SR 94 through the unincorporated but developed area of Rancho San Diego, following Campo Road about east. SR 54 and CR S17 continue northeast on six-lane Jamacha Road to El Cajon, while Campo Road and SR 94 split off to the southeast. East of Brabham Street, four-lane SR 54 continues to where it currently ends at the El Cajon city limit, though the Jamacha Road street name continues into the city to the route's previous terminus at the intersection with I-8.〔 SR 54 is part of the California Freeway and Expressway System, but is not part of the National Highway System (though SR 125 is), a network of highways that are essential to the country's economy, defense, and mobility. The route has three different names, including Jamacha Road from Campo Road to East Main Street in El Cajon,〔 South Bay Freeway from I-805 to SR 94, and Filipino-American Highway from the western terminus to SR 125. In 2013, SR 54 had an annual average daily traffic (AADT) of 22,500 at the eastern end of the route, and 127,000 between I-805 and Reo Drive, the latter of which was the highest AADT for the highway. In early 2012, portions of the interchange with I-5 were included on the Caltrans District 11's Spring 2012 Top Ten Congested Segments list.〔 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 54」の詳細全文を読む スポンサード リンク
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