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AC Transit operates 175 bus lines throughout the East Bay, including two lines under the Broadway Shuttle name. While AC Transit administers Dumbarton Express, it transferred operation of that service to MV Transportation effective 19 December 2011. Extensive local service connects 15 cities in Alameda and Contra Costa Counties and Milpitas in Santa Clara County. Transbay service is provided to San Francisco, San Mateo County, and Palo Alto in Santa Clara County. ==Route summary== AC Transit bus routes are arranged in six categories (five numbered, one lettered). Since its inception in 1960, AC Transit has used both numbers and letters to distinguish routes. Many Transbay rail lines were inherited from the Key System and converted to bus routes, and AC Transit continued to use letters to identify the routes. Many Transbay routes continue to follow the original Key System routings to some degree. The number and letter ranges listed below do not mean that all numbers or letters with a range are in use. Numbered routes operate within the East Bay: * 1 to 99 primarily serve the northern part of Alameda County and all of Contra Costa County. * 200 to 299 serve the southern part of Alameda County and Milpitas. * 300 to 399 serve combined portions of other bus lines, usually only at certain times of day or certain days of the week. * 600 to 699 operate on school days only. * 800 to 899 are part of the All Nighter network, which provides bus service during owl hours and at times when BART is not operating. One- and two-digit route numbers are sometimes used as a "base" number for three-digit route numbers. For example, Route 339 is "based" on Route 39. Lettered routes (A to Z) provide Transbay service (i.e., service across a bridge) between the East Bay and San Francisco, San Mateo, and Santa Clara Counties. Suffixes (also lettered) are used on some local and Transbay routes to distinguish different routings. Currently, A, B, C, L, M, R, S, and X are used. Some suffixes have special meanings: * A - Denotes ''Clockwise'' service, as used on Routes 25 and 49 or can denote one section of a split line, as used on route 51. * B - Denotes ''Counterclockwise'' service, as used on Routes 25 and 49 or can denote one section of a split line, as used on route 51. * C - Denotes ''Combined'' service on Transbay routes, where portions of two or more routes are combined into a single route during the PM commute period. Used on Routes LC and NXC. * L - Denotes ''Limited stop'' service, where not all local stops are served. Used on Routes 58L and NL. * R - Denotes ''Rapid'' service, which is similar to limited stop service. Used on Routes 1R and 72R. * X - Denotes ''Express'' service, where portions of the main route as skipped entirely. Used on Routes NX, NX1, NX2, NX3, NX4, and OX. Supplemental numerical suffixes are used to differentiate route variations for lines that already use a lettered suffix. This is the case with the NX lines listed above. ''Note: Routes listed below are current as of December 15, 2013.''〔(Major service changes effective December 15, 2013 )〕 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「List of AC Transit routes」の詳細全文を読む スポンサード リンク
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