There is an issue with quite a few tracks exactly like Dover. Dover is the worst. It is caused by the way the track meets apron. They cross, rather than join. AI cars cannot handle this intersection. It is something I would like to fix. The tools I currently use don't allow me to fix it. It means learning a new program like 3dsMax. Obviously time constraints also. First priority has always been online, but I am keen to get offline racing working well also. I don't mind an AI race from time to time.