This mod will set up traffic for the Tokyo R246 map mod, which you can get from here:
https://drive.google.com/file/d/1qGhJGRWlMP_e5k9_8lO_8V4Gkr0iGbVK/view?usp=share_link (for FREEROAM delete rceday.kn5 from assettocorsa\content\tracks\ddm_gt6_r246)
Of course to make the mod work, you need 2REAL's Traffic Planner, and you can get it by following the instructions written in this page right here:
https://www.racedepartment.com/downloads/2real-srp-shibuya-realistic-traffic-simulation.55690/