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4 comments
In Cambridge we have cycle-only lights that work with normal detector loops for 99% of bikes (certainly all metal frames). It's not rocket science to configure the "all traffic" ones to do so too
This isn't a new thing in the US or really remotely newsworthy - in California almost every city and town has traffic lights that detect both cars and cyclists. It's very common in other states too. There's normally a special marking on the road you line your bike wheels on that triggers the sensor and makes the light go green if there's no other cars around. Works fine with my carbon bike, even with carbon wheels, I assume the metal spokes, chain set etc are enough to trip the sensor.
As an example:
http://bikeportland.org/2010/09/27/bike-science-making-sense-out-of-sign...
The only traffic light within miles of my rural Maine (USA) rides has a motion detector that responds very well to cyclists. I believe it was installed as there is a school near the junction (aimed more at pedestrians than cyclists) but I'm not complaining.
There is a bus/cycle lane near where I live with a priority light on it. It detects my ancient, steel winter bike, but will have no truck with aluminium or carbon fibre.
Luddite lights?