Cartype t = {position : Playground.number;x : Playground.number;speed : Playground.number;steer : Playground.number;}val start : ttype params = {max_speed : Playground.number;accel : Playground.number;brake : Playground.number;decel : Playground.number;off_road_decel : Playground.number;off_road_limit : Playground.number;centrifugal : Playground.number;}val params : Playground.number -> paramsval drive : params -> Road.t -> Playground.keyboard -> t -> t