Speed cameras are marked ahead of its location? Really? I've not seen that - you get general camera signs. In Scotland the Gatsos are painted bright red/yellow. Somel cameras aren't always a Gatso. Theres a Truvelo and SPECS and then theres mobile locations (where Police hide behind hedges). Its handy to know where these locations may be. Even if they are marked very well, they may be obscured by trees, signs, buses etc. I nearly went past one today and I hadn't seen it because I was busy avoiding an idiot in a truck.