nextbus
Real-time arrival information from NextBus can be obtained from signs installed at transit stops, from computers with access to the World Wide Web, and from cellular telephones and other wireless devices. [1]
NextBus is a vehicle tracking system provided by NextBus, Inc., for buses, trams, light rail operations and other public transportation vehicles. [2]
NextBus will display the time the next transit vehicle will arrive at the stop you specify in only five steps. [3]
NextBus is a pilot project that uses satellite technology to track a bus along its route. [4]
NextBus uses Global Positioning System (GPS) tracking satellites to provide accurate vehicle arrival/departure information and real-time maps to passengers and managers of public transit, shuttles, and trains. [5]
NextBus also is available on 35 routes for AC Transit (which services the East Bay region of the San Francisco area), 8 routes for Emery-go-Round, 5 routes for Water Emergency Transportation Authority (the ferries), and multiple routes for Genentech, a private company in South San Francisco. [...] These times are available via the NextBus website and electronic signs at bus stops and tram stops. [2]
If your stop is served by multiple routes then you will also be asked to specify (5) your destination stop so that the system can provide predictions for any other routes that serve the same stops. [3]
The accuracy of the predictions vary depending upon many factors including changes in traffic patterns, accidents, Internet traffic, etc. [1]
Taking into account the actual position of the transit vehicles, their intended stops, and the typical traffic patterns, NextBus estimates the bus arrivals with a high degree of accuracy. [6]
NextBus has adopted a policy not to accept Internet advertising for certain classes of products that our transit partners and/or we would not view as socially responsible. [1]
Vehicle arrival times will be displayed on electronic signs at bus stops, streetcar stops and station loading areas, to the internet and to wireless devices such as cell phones and PDA’s. [6]
To obtain information via the Web or from wireless devices, specify which stop you want information for. [1]
In the San Francisco Bay Area NextBus serves all 86 routes of San Francisco Municipal Railway system. [2]
Simply select (1) your state, (2) your city / transit agency, (3) your route, and (4) your stop. [3]
Sources:
[1] About NextBus Predictions
[2] NextBus - Wikipedia, the free encyclopedia
[3] NextBus Stop Selector
[4] AC Transit | Rider Info | NextBus
[5] NextBus Agency Selector
[6] NextBus/Press Room