That same camera at that exit (I think it is 36?)gets you if you cross the white line betwen the two exit lanes. The guy in the car manually triggers it. It would be there at least 5 days a week.
You can do what ever speed you like between the Abu Dhabi cameras pretty much. They so have some portable cameras but I have never seen them North of Shahama. The police are more likely to pull you over for flashing your lights or undertaking than they are for driving in excess of 140 in Abu Dhabi.
Also note that the last camera before the IL76 on the way for the Barracuda has dropped to an 80 zone so flashes at 100.