TV stations in 22 U.S. cities announced Thursday that they will start broadcasting their signals this year in a format designed to be received by mobile devices like cell phones, MP3 players, GPS units and in-car entertainment systems.

Unlike current mobile TV services, the broadcasts would most likely be free, and would provide access to local news, weather and traffic updates. The broadcasts could also fill an important role in emergencies like hurricanes, since they can be received by portable devices and do not jam up under load like cell-phone networks.

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