Hello @rafiox22!
Hopefully I can help with the issue! So if it's only crashing in those two cities, then it probably has something to do either with your computer/internet. Since Duisburg is one of the busiest cities in the game, it puts a lot more strain on your internet and computer loading all the vehicles and trailers.
One thing I can suggest is going into your settings and under gameplay, their should be a setting that disable trailer cables on other vehicles. This should help drastically with the lag.
Another suggestion I have, make sure you don't have a lot of processes running in the background, as this can bog down your performance, and driving in these areas, like I said, can be a massive strain on your computer.
I hope this helps,
Regards,
Mirage