Fast_lane.aip - If you are looking for a deep dive or a "blog-style" technical breakdown, these are the best places to look: : It defines the path and behavior of AI-controlled cars on a track. fast_lane.aip : The "source of truth" for why these files exist and how to implement them for server-side AI traffic. If you are looking for a deep dive : Unlike standard AI files, .aip files are often required by AssettoServer to enable traffic on online/LAN servers. fast_lane.aip