Because each metro monitor will be connected to the Internet, each will have their own specific IP addresses. So when a commuter updates from a monitor, people back at metro central can see which monitor is posting and from what location. Therefore, if a commuter forgets to specify which bus is down or which line is delayed the controller can edit the post or specify which locations are down from the networks.
Furthermore each connection to the web should be a secure connection especially considering users are potentially connecting their devices to the monitor in order to download data. This also ensures that when commuters are transferring information from the metro monitors onto their phone devices, they won't be downloading anything unsafe (generally).
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