I get pissed by people doing what you two do. The problem is that in the U.S. no one understands the most efficient way to move through such a narrowing down of lanes. In Canada, at least the highway department gets it. They have signs along the way saying FILL ALL LANES. Then when you get to the bottleneck, there are signs that say TAKE YOUR TURN. It moves more cars through in less time.
Drivers in the U.S. don't get it, but maybe those in Canada wouldn't either, without the signs. Think about it. If everyone moves over into one lane, all that empty pavement is going to waste. The line just gets longer, and eventually oncoming traffic is too far away for the drivers to be able to notice a closure up ahead, so they get "stuck" in the lane that is closing, and jerks like you two won't let them in, because you think
they are all jerks. So, they keep driving, or they make the wrong choice and turn on a blinker, and stop! Using the car's horn and your middle finger really helps the situation.