Plazbot. The 100 limit has been extended now up to just before the Ibn Battuta Gate Hotel complex, in the direction towards Abu Dhabi. I got caught doing 120 there ten days ago. Sly change.
However, on the inbound carriageway towards Dubai, the 120 rule still works up to the Big Guitars at Hard Rock.
Once hitting the AUH border, 140 is safe. The last camera as you exit from Dubai just before the border often zaps unsuspecting folks.