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Use lenticular traffic lights to obscure the color of the light till a car is only a few feet away from the light. In other words, a driver cannot know if the light is green or red untill he is close enough to the light to see it and therefore has to slow down.
The lenticular aspect may be adjusted
according to the desirable speed to be enforced.
Similar to mitxela's Idea
Adapted form mitxela's lenticular light idea. [painperdu, Jan 14 2009]
||I don't recommend that. Somewhat like blind corners, there will always be some moron who figures that if it might be red or green, it must be green, and just keep driving.
||No. What we need is a thing to speed traffic up.