I came to the conclusion that AI TrafficSpeed makes AI traffic faster, but author created it without any reference to the posted speed limits. So, almost all drivers are speeding, especially in Los Santos, which is not the immersive feel I am looking for. After asking people outside of this site, we concluded that a good AI traffic speed mod is actually missing. If you think you could create one, you would probably fill a hole in the market, and many players would be grateful, especially if its compatible with MTFO.