Stoplight turns red for speeders

The city of Pleasanton, California has come up with a funny way to punish speeders:

[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.

Link (Via Paul Boutin)

UPDATE: Benjamin Leng sez: "In the small german town i grew up, we had one of those for years. A friend of mine found out that when you entered the town with a speed in excess of 160km/h (metric and proud of it), you could pass the light before it coud turn red. So the really bad speeders rushed through this town in a even more insane speed. Human irresponsibility beats well-meaning technology once again."