Several modded maps offer high-quality urban layouts specifically optimized for dense traffic. Tokyo's Shuto Expressway (Shutoko Highway Project)
This is usually a conflict between Sol and your CSP version. Use the "Reset to Defaults" button in the CSP settings under Weather FX if you tell me: you are running (specifically CPU and GPU). If you are planning to play Single Player Multiplayer servers (like No Hesi). If you are using standard monitor Assetto Corsa City Map With Traffic Mod