I was trying to fix some traffic issues on the main highway interchange cuz GOD a huge line of vehicles are pilling up trying to enter the city , so I decided to try and test out a roundabout instead of an intersection and test how it would flow and then I see a problem. No matter how many lanes I add for vehicles from other roads to join, MOST OF THEM USE ONLY A SINGLE LANE causing the vehicles from the highway ramp to slow down while trying to enter the roundabout. that roundabout is literally six lanes one way and all the vehicles still only use the very end one cutting off the ones in the highway ramp. Is there anything I can do about this?

I tried to upgrade different roads into different lanes but non of them fixed the issues and I can't seem to control which lane connects to where. I even considered getting the TM:PE mod but for some reason out of all the mods I use, that mod seems to not work, I tried searching for a reason or how to fix it but no matter what I try it just breaks my content manager. Even if I removed all the other mods it still not working. So practically by now I'm having multiple issues. Any advice? Thanks in advance.