Cars use lights, bells and buzzers to remind drivers to fasten their seat belts as they start their engines.
It would seem natural, then, to offer motorists friendly, yet stern warnings about another bad habit: holding a cell phone while driving, whether for texting or talking.
Several software and gadget companies -- many of them at the country's biggest trade show for the wireless industry last week in Las Vegas -- have sprung up to address that challenge. But creating an effective, widespread solution looks a lot harder than putting in reminders for seat belts.
Furthermore, we're only just beginning to figure out what constitutes a dangerous distraction, and how best to curb it. Are handsfree conversations dangerous? What about dictating text messages to your phone? Does everyone need help staying away from the phone while driving, or just teens and employees?
Many states ban drivers from using cell phones without handsfree devices, but a recent insurance industry study found that such laws haven't reduced crashes. It's not clear why, but one reason might be that drivers flout the laws.
At least a dozen startups have produced phone applications designed to curb the temptation to use the phone while driving.
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