Ok there's a road near me that has limits that change about every 200 yards it goes 30, 40, 50, 40, 50, 30 etc etc all the way along. Now driving along that I'm looking at the speedo more than the road! If I were to hit the car in front up the jaxy I'd no doubt get a due care conviction, so is it a defence to say you couldn't watch the road and the speedo at once! Seriously there is a growing body of evidence that suggests speed camera's etc are causing accidents!
drivers cause accidents. Speed cameras don't make the law, they just provide evidence. Speed limit signs are a different matter, they do make the law and I reckon you'd have a decent defence if you told a court you had to take your eye off the road to keep up with them.
Geezer in York we have this trouble with speed bumps. I find I'm watching out for the next bump, speed limit 20,then it's 200 yards at 30, then more bumps and back to 20....it's utterly ridiculous.
im not a fan of speed cameras, some of the roads where i live which were considered accident blackspots the cameras have made no difference what so ever..and as you say , you spend more time looking out for them and the speedo than fully concentrating on the road.
When they first came out i know of one that was hidden behind a sign in a 30mph zone approaching a junction, (work the logic of that out),dozens of people got done many at 32 & 33 mph.
The speed limit signs are NOT the law. The actual locations are detailed in the Traffic Regulation Order for the particular road. Should you wish you check / confirm the details at your local council offices.