Jean Todt to change rules on in-season testing and tire changes . Teams to run tire tests at FIA on 2013 . Formula One 's governing body is taking the unusual step of rewriting its own rulebook in the middle of the season in an attempt to end the tire crisis threatening to undermine the sport . FIA president Formula One says driver safety must be the priority . Six tire blow-outs at the Canadian Grand Prix have inflated safety concerns .
Jean Todt to change rules on in-season testing and tire changes . Teams to run tire tests at FIA on 2013 . FIA president Formula One says driver safety must be the priority . Six tire blow-outs at the Canadian Grand Prix have inflated safety concerns .