I'm not worried about the number of ships, I would prefer them not to overlap with each other, but that is another thin,

it is the vehicles which suddenly becomes a problem, and it is weird that you would think with two cargo hubs, one may get busy before the other because I may build around one of them, but both seem to have got busy at the same time.

And again, the number of trucks seemingly increased to both hubs at the same time, so the number of total trucks increased massively for what looks like no obvious reason. The trains especially seem to start leaving without being filled, with some 20% and below, and sometimes single figures. Don't fully fill the trains, and more traffic seem inevitable.

I will probably play about with adding other hubs, but if the game keeps not filling trains, I may just get traffic problems somewhere else. I'll have to see. It depends in what direction I go in with regards to buying new squares to fill.
As you can see below, the hubs are spread out, and atm nowhere clear to put any new hubs. The hub at the sea, has had two areas either side of it, but that wouldn't explain the other hub getting saturated with traffic, as there is a lot of space around it as it is at the edge of an oil field and at the edge of the map.
View attachment 943562
I've really liked this map though, and in the open areas there are subtle changes in elevation which look great at street level with the roads rising and falling as you move around some districts.
Just as an aside, with regards to oil reserves, why does the oil get used up so quickly. If oil run out so quickly anywhere near real life at that speed, and it would not be financially viable to build. It seems out of step with the forest and farming, though obviously a renewable resources, but even so, there have been small oil . I've had to resort to manually putting the oil back into the ground to keep it going, which doesn't feel right, but there you go.

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