I was thinking of lane closings due to road repair, accident, etc. Not the built in merge lanes. And yes, they drive right up to the barricades and EXPECT the next car to let them in. 99.5% of the traffice has vacated the closing lane before that point - I find it hard to believe that everyone is wrong except the one who feels entitled.
I have contacts in the transportation field, but it is true that most people don't know the proper way to handle lane closures.
And it's hard to drive to the end when you know people aren't going to let you in. But it is true that if everybody stayed in their lanes, and then cooperated in a smooth merge at the point where they lanes join, you'd move a lot more cars through the choke point.