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With Google Ride Finder, you can search for taxis, limousines and shuttles and make better decisions by seeing the exact location of vehicles in your area. Just enter a zip code, the name of a city or even a specific address. You will get a map showing the companies and where their vehicles are located.
Interesting idea. Just waiting for the taxi companies to realize they can rig it by telling Google they have taxis where they don't.
This is really a cool feature. Only thing that would improve it is if they used a Pacman graphic theme instead of a boring old map and pushpin.