I'm going to have to pick on this post for its silliness.
As far as I am aware, the minimum speed camera limit is 30mph. Unless some local councils have them at 20mph in their reduced speed zones. Then there is the fact that 30mph speed cameras aren't triggered if you are going 31mph, it's a much faster speed.
Unless you are a professional cyclist, there are few who will be going at a speed of 35+mph to even be able to trigger a speed camera. I'll give you that on a downhill it might be possible.
You could still be charged with some kind of wreckless control of a vehicle if it warranted it. I seem to remember there was a guy on rollerblades who triggered a camera on a downhill and they brought charges against him for wrecklessness, no idea what happened though.
Ultimately my point is though that Cyclists very, very rarely trigger speed cameras, so getting in a huff about it is moronic.