Waihanga i tētahi putanga matatini ake o tēnei rerenga The Williams FW31 is a Formula One motor racing car, designed and built by WilliamsF1.
Ko te tikanga, ko te putanga matatini ake o te rerenga ko "Ko te Williams FW31 he racing motokā Formula Kotahi, e ka whakamahi Williams ki te whakataetae i roto i te 2009 Formula Kotahi wa. "