"Pete Boyd" wrote in message
.. .
New overhead cameras have gone up on the approaches to Tower Bridge with
signs mentioning camera enforcement. What are they enforcing? The 20mph
speed limit? If so, how - average speed over the bridge?

Are these in addition to the ones that have been there for a couple of
months or more (three on a gantry, each end of the bridge, two facing one
way, one the other)?