Training speeders to slow down, lab rat style

Dan Berkes sez: "This story from the online edition of the San Francisco Chronicle reports on the city of Pleasanton, CA and its test of a new traffic control system to curtail speeding drivers. A sensor 350 feet away from a stoplight measures traffic, and if that traffic is traveling at more than 10mph above the posted speed limit, the light turns red for that/those driver(s). It's a 10-second stop unless cross-traffic is waiting, at that point leadfoots can cool their heels for 30 seconds." Link
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