I am making a long road using high way construction kit. i want to add traffic cars which run automatically in specified path. For that purpose i need to record the entire path geometry of my long hapazard roads to run an AI car... but i can't record it.. I made the record option checked and connect a car then pressing R at run time .. but it can't show the path geometry from which i made the car run.. 
it seems to be difficult..   i need a perfect tutorial to record the path.. please any one help me in this regard