Fiddling with your iPhone behind the wheel can get you fined across much of the nation. However, many states are more than happy to tweet you with up-to-the-minute directions on how to steer clear of a traffic jam. It is a mixed signal that some safety experts and politicians say could be dangerous. At least 22 states that ban texting while driving offer some type of service that allows motorists to get information about traffic tie-ups, road conditions or emergencies via Twitter.
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