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I agree with AlanLaRue that there should be both P2P network and vehicle-to-infrastructure communication. Vehicle-to-vehicle communication will make roads safer. Vehicle-to- road infrastructure connection will make traffic management and speed regulation more efficient.
The future of driving is connected cars: connected to the cloud, to the city grid, to the road infrastructure and to other vehicles.
http://www.call2collaborate.com/apps/blog/show/16330252-driving-connected-web-2-0-and-the-future-of-cars