Estimated time drivers save by using real-time GPS traffic updates
Drivers that use GPS systems with real-time traffic info spend 18% less time behind the wheel than those who do not.
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Nice job dividing 18 million and 12 months into the $18B. However your calculator misses a bunch of other key assumptions that completely negate your conclusions. Look at the Light Reading material and the rest of it out there, and you'll find that it's not as simple & clear as you make it out to be.