I figured out a trick for that situation; about 1/4 of a mile before the merge if traffic isn't to heavy take the center.
Drive right down the center lane, pisses everyone off.
I do that leaving school all the time because the freaken moron kids all think its some Xbox race trying to merge in at twice the speed limit at the last second. I have had enough close calls to just say F it. I park my big S class right in the freaken center blocking both lanes and give them the finger. Works amazingly well.