Mobile devices are integral in this idea. If possible, metro applications could be published on both Android and iPhone operating systems for free. The application would include real-time updates, schedules, direct connection to a city's metro system's blog and forum site, virtual map that tracks transportation, and would be able to be integrated with other mobile services such as text message and/or e-mail alerts. Widgets (an Android function) could be created (much like the AccuWeather widget) that could be set to certain locations or routes or even specific schedules.
Back to RFID chips, some sort of scanner could possibly be developed for mobile phones so that they could scan and alert users of monitors with RFID chips. However, because active RFID chips (with special qualifications to withstand weather conditions, deterioration, etc.) are relatively expensive (ranging anywhere from $3 - $10) to mass produce and install on every monitor perhaps another application can be created to help mobile phone hone in on monitors such as a Bluetooth modification. Bluetooth could be constantly activated and automatically connect with a monitors which could also be installed with Bluetooth devices.
Another alternative is some sort of WiFi/web application. Every monitor could possess its own network and broadcast that outwards. Users could then connect to a monitor's network and be instantly directed to a mobile site that has all the information previously mentioned (e.g. schedules, updates, etc.) but users would be limited to accessing only the website and its facets.
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