I don't like the NCZ area, it's still a simulation server and not the arcade server. Not everyone is driving like they should do, everyone knows that, but now Duisburg is like a ghost city for me. I have no reasons anymore to go there because there's no realism anymore.
It's hard to find a suitable solution to remove the chaos in Duisburg, the people that drive reckless, or don't drive realistic won't change their way of driving because it's a NCZ are now, on the contrary. I think people will drive more reckless in Duisburg because of that NCZ area, and then they gonna take those worse driving skills to other driving areas. Then the problem is not resolved, but it just moved to different areas, more exactly to CD road, Calais and the surrounding cities of Duisburg (Dusseldorf, Dortmund, ...).
I think the real problem of Duisburg is the city layout, because there can be as much people in Calais and there it is less chaotic. In 1.40 they will change some road structures in Germany, but none of are beneficial for this problem. Therefor I think that the only solution is to edit the map on TMP, I think there are three suitable options:
Adding an extra exit way out of Duisburg, this could enhance the traffic flow out of the city.
Changing the current exit (the one that is mostly used) to a double lane highway with a barrier dividing the two driving directions from eachother. This would then be a bit similar to Calais' exit, where we see a better traffic flow out of the city.
Rework all the intersections so that people don't have to wait at traffic lights, or don't have to stop for traffic signs. Everyone knows that some people don't follow traffic rules (viz. driving trough red while the others have green, running STOP-signs, don't give way, ...); making it so that people almost never have to stop to come on the CD road would result in less crashes and less traffic jams, or at least traffic jams that are still moving and are not standing completely still.
These are just some ideas, I think the two last ones combined could result in a better traffic flow out of the city, which would lead in less people in the city and also less chaos.