I lived in Qatar for 7 years, drove a car. All speed cameras are not visible. Some are marked with sign boards, but many are hidden permanently on a lamp post, or in a palm tree, or in anything. There are even mobile cameras, which an operator puts on a heavy tripod, & goes away, & camera takes photos of offenders & send back to data centre. Cameras are on highways, on streets, on intersections. Every traffic signal has built in camera. Fines go up progressively with each offense & over the limit. Owner of car gets a mobile notification as soon as his car speeds in front of camera. All fines are payable fully at yearly registration. If paid in some x days, there is a discount.On Holy Month of Ramadan also sometimes there is a discount.

The biggest is, there is no need of a man standing behind camera. Two photos taken apart a second or such are the proof. Owner can only contest it if he has gps recordings. Speed limit is speed limit. No +5 or +10.

But then, fine amount stings only if they are enough. For an expat like me, a fine of $200 is a lot. For a local Qatari 20ish year boy, thats nothing. Some of my photography club members had fines in tunes of $2500 a year, & totally normal.