Personally I am against making cities on a simulation server no collision, it removes the simulation aspect and might as well be arcade. Someone I believe said that Duisburg is hardly simulation now, slow moving traffic I would have thought to be one of the most accurate forms of simulation there is, we've all sat in rush hour traffic and traffic jams in real life. 90% of players entering Duisburg do so fully knowing of the risks that involves and it should remain their decision to make.
There are steps that could be taken to make Duisburg an easier place to access and better increase the flow of traffic without the need for NCZ. Adding an extra fuel station opposite the one already just outside the city would mean much less traffic stopping in these areas to cut across the road into the singular fuel station. Having one more of everything (f7 and garage) would be beneficial and help spread people across the city more.
The addition of NCZ has also appeared to create a new issue on the border where no collision becomes collision. We've all seen how many incidents occur when two trucks leave industries at slow speed at the same time crashing into each other, what this does is replicate this issue but at much higher speed. There will be people unsure about when the NCZ ends, people trying to race through the NCZ and probably inevitably players who will wait just outside the NCZ wishing to be a nuisance.
On a side topic:
The apology made by Aek for the comment a game moderator made labeling all players who drive the Calais - Duisburg road the same is a welcome one so thank you, but this is a problem that runs deep within your current game moderation team. I am currently awaiting an answer to feedback from the game moderation management team regarding another recent incident where a different game moderator has expressed these same incorrect views while conducting appeals.