I think they should rebulid the Duisburg-Calais Road because ist Only 2 Lines and you have no options to overtake someone.
And the Gas Station they should do an NCZ, then you dont have to wait if a fuel pump is free.
It would be important for me to expand the road to at least 4 lanes, that means everyone has 2 lanes on one side and can overtake.
Special descents to the gas station so that there are fewer traffic jams.