i know for sure i seen a masters rexrainbow capx somewhere with some racing cars and AI going in circles topview and they where awesome actually, even hard to beat, but not cause of their speed, cause they where smart little buggers <img src="{SMILIES_PATH}/icon_e_biggrin.gif" alt=":D" title="Very Happy">
i think was called LJ potential or CAR AI if you dont want something complex thats what your looking for <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile"> i found it awesome at first sight i bet u will also <img src="{SMILIES_PATH}/icon_e_biggrin.gif" alt=":D" title="Very Happy">
he has a custom plugin made for racing AI i think ... that is a first start i guess all car ai's of rexrainbow that i know off and are shared.
however for "actual try to race you " that is no AI you seen in big games, that is a shadow past gameplay of a experienced user or maybe a multiple users moves database trying to beat you. which is called shadowing, and its difficult to do, since you'l need game plays from multiple human beings and the only ones with enough AI RACE capabilities at that scale are EA games and they NFS series since 1980 till now they have tons of data u could use... if u had access too <img src="{SMILIES_PATH}/icon_e_sad.gif" alt=":(" title="Sad"> sadly... we dont have access to that data... so we just need to start slow and little, with small little games, capture game plays and moves... re-use it, in future gameplay. and so on till actually AI gets good. however all the blabbing from above might not even be possible in C2 since you basically need to create a small neural network. but if u find a good racing AI in C2 let me know cause i want to get it too <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">)
this might also help you
he talks about racing AI i think.
some explanation how to give waypoints of the map to AI
raycasting AI - live AI guiding itself using raycasting.
racing neural network
racing genetic code/neural network
also you might get a AI using waypoints or mapping for AI like in counter strike if you know what i mean.. where the AI/BOTS wold learn the obstacles and map hidden areas best spots etc and use them.
edited the original AI capx publishers.... my bad i apologize.