CarTel project to researching cars as mobile sensors

Data about road and traffic conditions can come from radio stations` helicopters, the Department of Transportation`s roadside sensors, or even, these days, updates from ordinary people with cell phones. But all of these approaches have limitations: Helicopters are costly to deploy and can observe only so many roads at once, and it could take a while for the effects of congestion to spread far enough that a road sensor will detect them.

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