Definitely an interesting idea. I wonder if haptic feedback for GPS navigation could somehow be integrated into cars. The steering wheel might work.. except people are often pretty bad at keeping both hands on the wheel. Maybe in the seat.
Simple left/right indications are fine for walking, but not for driving. You need explicit lane guidance, or else you'll miss practically all your turns driving a new route.
Even if the GPS is accurate to a few feet, it doesn't know where the back of the line in the left turn lane is!
