I too had one near AL SOUDAN-AL AZIZIYA-AL MURRA Al Bustan for 300 Q.R, I don't remember having gone over the radar limits. I asked the traffic policeman but what he said made no sense to me. Maybe you can go to the traffic dept at Madinat Kahlifa and ask for the pics if the have one. I am not sure if you will have to pay QR 10 per pic view.Anyway keep an eye on the speed limits as 4 roads from one roundabout will have 4 different speed limits despite being in the same desert!