Ill tell you what annoys me the most about average speed cameras, it's not that they are there, or that they go on for miles or that they limit you for non existent roadworks.
It's idiots who for some reason do not understand the work average. Those that slow to 50mph through the camera, speed up to 80, slow for the next set of cameras, speed up etc etc
Now average would put their speed at 65mph. What goes through peoples heads when then say, "nah it's just when you go through the camera" Umm, sure, OK!