Ialso got fined for overspeeding in the wakrah-ummsaieed road.Dont know where . They now have lot of mobile radars which will catch u unawares. These highly sophisticated radar doesnt have flash. They can be inside a vehicle parked on the road, or in pickups , etc..
Dont go by the english version of the traffic violation. Go to the arabic version and you will get the clear description of the violation.
Loading / unloading means overspeading. I had to pay QR 700 for the same and you will also get 4 points deducted from your license. If you violate the traffic rules in qatar for upto 14 points(pl. confirm with the authorities)your license will be confiscated and you cannot drive for a period of 6months, I believe.
And if you don't pay up the fine within a certain time limit you'll be liable to charged a fine over & above your penalty.

Safe Driving!!!!