It uses GPS in the smartphone device to detect whether or not it's moving at a driving speed and when it does, it blocks the smartphone device from being used, so you can't receive incoming text messages or send out text messages.
Their next app will be released in February and will keep teens from looking at texts while driving.
The Iowa DOT will give the app free to all Iowa teens 14 to 17.
They'll also make it available to other drivers at a minimal cost.
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