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State Route 13 (SR 13) is a state highway in California. It is a short loop in Alameda County currently built from Interstate 580 in Oakland to Interstate 80/Interstate 580 in Berkeley. It consists of three contiguous segments: the Warren Freeway from I-580 to State Route 24 in Oakland; Tunnel Road, a narrow two-lane road to Claremont Avenue in Berkeley; and Ashby Avenue, a main east–west street through south Berkeley to I-80/I-580. ==Route description== SR 13 is part of the California Freeway and Expressway System. SR 13 is known as the Warren Freeway from Route 24 to Route 580, as named by Assembly Concurrent Resolution 96, Chapter 166 in 1957. The route currently begins at Interstate 580 near Mills College in East Oakland and continues north as the Warren Freeway, named after former Alameda County District Attorney, California Governor and U.S. Supreme Court Chief Justice Earl Warren. The four-lane freeway takes a largely straight path as it runs through a scenic valley. This valley is enclosed by the far eastern hills of Oakland and a shutter ridge that has been driven northwestward along the Hayward Fault, and the entire freeway lies within the earthquake fault zone of the Hayward Fault. In the event of a major earthquake on the fault, this section of SR 13 may sustain heavy damage. Numerous overpasses have recently undergone extensive seismic retrofitting. The tall trees on the highway's side make the highway appear narrower, and until late 2004, a dense group of trees also lined most of the highway's median. For most of the day, the freeway experiences only modest traffic, which makes it a speedy bypass around downtown Oakland. Much of the traffic on this highway comes from SR 24's commute hour congestion backing up onto SR 13 northbound via the exchange between the highways. After going through an interchange with State Route 24 (completed August 1999) near the entrance to the Caldecott Tunnel, however, SR 13 takes drastic changes in its quality and capacity. The freeway ends at an uphill junction and the route is defaulted onto Tunnel Road, a much more narrow two-lane road that bends to the west and winds downhill. Upon reaching the foot of the hill, Tunnel Road becomes Ashby Avenue, a markedly urban (and very busy) two-lane street with an east–west routing. Entering Berkeley, UC Berkeley is north on Telegraph Avenue, while a BART station is located at Adeline Street. Past San Pablo Avenue (SR 123), Route 13 (as Ashby Avenue) runs through a more modest neighborhood before reaching its current end at Interstate 80/Interstate 580. 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 13」の詳細全文を読む スポンサード リンク
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