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Shanghai has more than 1000 formal bus lines (including downtown and suburban lines), served by more than 10 bus companies. In the past, Bashi, Dazhong, Guanzhong and Qiangsheng were the four largest; around 2009 they merged to become Bashi Group Companies, including Bus No.1-6 Companies, Trolley Company, Baoshan Company, Chongming Company, and Jinshan Company. Bashi Group buses are colored green. Pudong District has its own bus companies, painted blue. The Shanghai bus fleet has become increasing green in recent years. As of May 2015, the system has over 1,700 new energy buses, amounting to over 20% of the entire fleet. Since 2006, Shanghai has been the leading Chinese system to implement electric and hybrid buses. During the 2010 Shanghai World Expo, the city piloted a program that includes 256 new energy buses with low to no emission. Some routes are operated by the Shanghai trolleybus system, and although the number of such routes is relatively very small compared to the overall Shanghai transit network, the trolleybus system carries the distinction of being the oldest existing such system in the world〔Murray, Alan (2000). ''World Trolleybus Encyclopaedia''. Yateley, Hampshire, UK: Trolleybooks. ISBN 0-904235-18-1.〕 (of more than 300 such systems still in operation in 2011); it opened on 15 November 1914.〔 During the mid-2000s, the city converted many traditional trolley routes to a standard diesel fleet because of route flexibility, speed, and eliminating the visual pollution of overhead wires. However, the obvious benefits of the trolley buses have brought back a renewed interest in keeping and developing the program. In 2013, the Trolley Bus Company ordered 300 new trolley buses to replace the aging fleet and grow the overall number of trolleys in Shanghai. ==Naming scheme== Most downtown buses use numbers to specify the lines, while suburban buses and a few downtown bus lines use Chinese characters. In the recent decade, there has been increased activity in network optimization and as a result, many bus lines have been cut, shorted, and combined. Many named bus lines have been converted to number lines with a flat fare. Some regular lines have been changed to rush-hour only, while still keeping their original line numbers. 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「Buses in Shanghai」の詳細全文を読む スポンサード リンク
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