I stumbled across this article on how Google creates its maps. You can easily see how this info would dovetail with their driverless car.
A friend gave me a taste of real-time mapping with an app that shows where any give bus is at any instant in time. For those who live in bussable areas, no more wondering if the bus has arrived or is yet to come.
As with most technology, I find these developments both fascinating and frightening, as well as exhilarating and exhausting.