advice alert appropriate-behavior appropriate-behaviour behavior behaviour caution communication dangers fast freestyle freestyling fun information informing jet-ski jet-skiing limitations limited manoeuvrability mobility movement outdoors outside pastime power-sport recreation restricted restrictions risk risky river riverside safety sign signs speed sport transport transportation travel warning warning-sign watch watch-out water water-sports waterways wave-runners action active amusement bike biker biking danger dangerous extreme freedom helmet motion moto motorcycle motorcycler outdoor reflection ride riding stunt stunter trick wehichle wheel black competition cycle engine hanging high jump leisure men motor motorbike power sports track vehicle