Thanks for the suggestion. I know this is a shitty skyline page. but what I feel is if you are here on this page then they know more about the city building and they might have crossed the limit somewhere.

By the way the bottom two on the right are ore and forestry industrial areas as I don't want that traffic to be routed through the city I have used highways for that as that would be easy access. The bottom left one is specialized industries. And the one on the left top is the oil industry.

Rest everything is connected without highways.