There was a proposal to allow the use of speed cameras in construction zones to ticket drivers who didn't reduce speed. I could see the opportunity when the construction signs are posted well ahead of the actual construction work area. You see the sign, but there are no workers and no barrels because the work has progressed down the road a mile. You maintain your normal speed since this appears to be posted in error, but you failed to observe the speed camera just past the construction sign. Fish in a barrel.
I worked on the railroad years ago and hated it whenever we had to work near a crossing or roadway. My empathy is with the highway workers. Drivers can be crazy and unpredictable. Slow 'em down and enforce the law, but do it for safety, not revenue.