Its fine in Europe, but you still see people in cages get all bent out of shape. Just like in Michigan, when there is a closure in a lane, people can't just merge, you always get one ******* that has to be the policing person and puts his car half way in the lane to block people. Like they are the designated *******.
I think it would be fine "IF" people accept it. How many times do you see people swerve to stop you from passing them? I see it here often.
I just choose to not ride in heavy traffic if I can help it. Even in a cage, I try to avoid it. People are just too stupid when they get stuck in traffic.