These should be standard on all public transit, and should work automatically http://gizmodo.com/5890744/philadelphia-bus-troll-jams-cell-phone-signals-when-people-talk-too-loudly …
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These should be standard on all public transit, and should work automatically http://gizmodo.com/5890744/philadelphia-bus-troll-jams-cell-phone-signals-when-people-talk-too-loudly …