Speed Sensing Traffic Light

By Deane Barker on April 7, 2004

Stoplight to punish suburban speeders / Pleasanton finds a way to slow impatient drivers: Fascinating — they’ve found a way to turn speeders into red light runners.

In a move unprecedented in the Bay Area, the city’s traffic engineers have created a traffic signal with attitude. It senses when a speeder is approaching and metes out swift punishment.

It doesn’t write a ticket. It immediately turns from green to yellow to red.

Via Metafilter.



  1. There is one of these lights on Route 3 between West Chester and Lima, PA. It’s at an intersection at the bottom of a hill where people habitually speed. After I realized the nature of the light (often speeding home after a late-night movie), I began timing it. Now, the short delay before the light turns green again is exactly how long it takes for me to get to the light from where I am when it turns red, and I get to go a smidgen faster.

  2. “Okay Penguin Squad, we’ve narrowed his location down to somewhere in Pennsylvania. Fan out and kill anything sitting in front of a Blue Screen of Death…”

  3. “Ack!” /me goes wireless and flees across the border into Delaware, home of tax-free shopping, careful not to speed along the way…

  4. These lights are common here in the Netherlands. At least 10 percent of all traffic lights are equipped with these counter measures. Reason of this all: running a red light will cost you 200 USD, and speeding 5 mph al lot less.

  5. I think these traffic lights will promote the general good in our world! Ummm…. Yea, it’s something this comment is worth.

  6. I think traffic lights ROCK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! they help so much in this world and make it very safe too. They also need much brighter lights. Thanks for letting us speak out

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