The rules are there to make the gameplay better for everyone. Driving in these highly populated areas such as C-D road and even in the surrounding cities such as Rotterdam, Brussels ,Lille etc. Although certain people don't follow the rules, it's great to see an influx in moderators in those areas to set things straight and make sure that everything runs smoothly.
A tip on how to survive these areas would be to;
Don't drive at the top speed of the truck you're in (helps you control your truck in case of a crash on the road or stopped trucks).
Leave a suitable amount of distance from you and the truck in front of you (helps with certain players who can lag etc).
That is stuff that I can do to survive in highly populated areas as well as this - I tend to drive the speed limit (which annoys some players, not sure why) because it means that I have more control when driving.
If you want to visit the cities that I said above, you can avoid the large amount of players by viewing this topic created by @heyhococo ;