Since when is the law supposed to be fungible? Even better — from a certain point-of-view — than a radar trap based on an under-posted speed limit is a radar trap with a changing speed limit. One that can be dumbed-down at random and with no prior notice, at the whim of the same government workers who enforce the limits and profit from that enforcement. It’s called Variable Speed Limits and the Feds — through the Department of Transportation — are not only encouraging the states to adopt them, they are bribing them to adopt them. Cue Dr. Evil voice...