The docks are built separately, and one dock corresponds to one or two industrial chains, so as to avoid excessive crossing on the transportation road.
Don't have too many roads, and add branch lines to the main line as appropriate, because vehicles will not choose idle routes, but only pick the nearest road, and it is useless to have more roads.
Don't be too far away from the coastline, and the inland is reserved for buildings with little traffic demand.
Regarding the freight driver, it is equivalent to adding an intersection. I saw someone mention not to build on the side of the road, because cars will run out of it and start after stopping at the intersection, which will cause congestion. I also noticed that, so freight drivers will build on relatively empty roads, or build roads alone, but it will not solve the problem well. After all, it will always merge into the main road. Then refer to the second article to separate and refine the industrial chain and reduce the number of regional mobile vehicles.