A bicycle loop detector is a traffic control device. Read more here: http://www.techtransfer.berkeley.edu/newsletter/07-2/bike_detection.php
One of the pitfalls of the loop detectors is that bikes need to know how to place themselves to actuate it. In the event that one of these is installed, I will be sure to post more information here about its use.
Here are some photos on flickr: http://www.flickr.com/photos/voidoid21/1408419197/
Bike UMD 
Too many cyclists don’t know how to use the loops meant for cars. When you’re on a group ride and everyone pulls out in front of the induction loop in the road and complains that the light doesn’t work its really hard not to laugh at them
Hello! Do you use Twitter? I’d like to follow you if that would be okay. I’m undoubtedly enjoying
your blog and look forward to new updates.
We donot have twitter. But we do have a facebook page: http://www.facebook.com/BikeUMD
When I initially left a comment I appear to have clicked the -Notify me when new comments are added- checkbox and from now
on each time a comment is added I recieve 4 emails with the same comment.
There has to be a way you can remove me from that service?
Thanks a lot!
Thanks. I am not sure. I will look into it.
Good information. Lucky me I recently found your blog by chance (stumbleupon).
I have bookmarked it for later!