Anyone with half a brain cell can see its a giant waste of money. It will get thousand of cars down to the entrance of the tunnel faster...and make a bigger longer parking lot.

If you cram 2 lanes into 8 back into 2 lanes of the tunnel--sometimes one.... making 4 lanes to get to the 8 lanes is not going to fix anything when its those 8 lanes fully backed up . . But leave to state to think spending 10 billion dollars getting people to that few block stretch of the 8 lanes would speed things up some how.

Take that money and build a new tunnel .

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EDIT: Lets not even mentioned the 8 lanes were cut down to 5-6 at the entranced to make a reserve area for EMS vehicles years back .