The central station uses the sensor data to compute queue-length and departure rate statistics for each road segment, and uses Little's Formula to assign a time in seconds to each road link. This database is published once a minute on the Internet. Vehicles will use CDPD or a similar wireless network standard to download the relevant sections of the database, and plan optimum (shortest time or least fuel) routes through the road network, informing the driver of suggested route changes in real time. We have also explored adding other minimally expensive sensors to this package, such as piezo pickups for detecting road vibration and perhaps accident signatures, and temperature and humidity sensors to determine local road conditions.
Photographs and Images Relating to this Project:
An earlier prototype circuit for the RF and data collection sections
Car-counting data wirelessly uploaded from the above Vassar St. pothole, showing traffic building during the morning Cambridge rush hour, then abrubtly slowing as a traffic jam developed at peak commuting time (8 AM).
More Information on this System:
A brief presentation given at the Media Lab's CC++ Consortium Meeting in the fall of 2000.
Ara's M.Eng. thesis:
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