I was driving in Louisiana. The two lanes were being narrowed down to one. There was not a clear merge left or merge right. They had several signs like this:
I was surprised how well it worked.
That is what I am talking about. It makes sense. Instead, people like to either merge 3 miles early and then get pissed off when other cars are passing them because they think they are being responsible drivers when in reality, they are part of the problem.