m42 cameras

i know this has been done before but just cant get my head round what they achieve,there meant to be there to assist the flow of traffic but there a nightmare to get through up to the m5 for instance that hasnt got any, tonight at least 3 sets of roadworks going southbound so they can play about with 3 cameras, every night theres at least 2/3 blokes playing silly idiots up there poles while bedlam reigns below, why dont they just switch them off and go back to plan A which seemed to work a sight better than B :imp: :imp: