Log On and Drive?

Thanks to advances in wireless, we can now access the Internet via broadband connections even while on the highways. Car makers have (mostly) backed off from installing Facebook on dashboards, but what do you think of GPS systems that display directions on your windshield? A little guidance is welcome, but how can designers balance that against driver distraction or information overload for drivers experiencing congested, quickly changing traffic patterns? How much effort would you spend to optimize a windshield GPS? How much information is enough?

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