Thank you. Well, this is something you have to add manually by yourself. Its been a long time since I did it, and there should be more traffic packs around the web than when I searshed for it. Anyway, you should find some tutorials with googling something like "custom cars for csp traffic planner" :)
Could only wish that cars struggled less on splits/merges, but that's just the traffic tool complaint, not really something you can fix with traffic lanes... i guess.
Indeed, I tried every shapes and layouts but the system is afaik made for basic intersections, not yet for lanes insertions. Hopefully this will be improved in the future...
It's beautiful! Great for going cruising without having to worry about others getting in your way :) plus you can use whatever car you want, which is quite funny. Great work!