Something like that - Vlingo or equivalent - is the only real answer. People are spending more and more time trapped in their cars - many times in traffic. There is an expectation of being able to communicate, for work or socially, and text or mobile e-mail is superior to real-time voice when you need technical details: addresses, directions, codes, lists, etc.
When people say "pull over and make a call" or "only use your GPS while stopped" it sounds naive. Many times you are travelling 5 or 10 mph in a traffic jam. You're not stopped and can't stop (no shoulder or offramp). We've just got to get better about providing more safely implemented capabilities to the driver -- not just banning or disabling things because people will find a less safe workaround.
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