action active amusement bike biker biking black competition cycle danger dangerous engine extreme freedom freestyle hanging helmet high jump leisure men motion moto motor motorbike motorcycle outdoor power ride riding risk speed sport sports stunt track trick vehicle wheel Australia background ballast blue bolt brown bush clips country crossing day Dirt grass green grey horizontal landscape line nature photo photography pine railroad railway rural safety scenery season sign sky sleepers straight timber train transport travel tree winter alpine alps Austria cab cable cableway car cold empty gondola holiday mountain move outdoors recreation resort ridge ropeway ski slope snow snowboarding top transportation UP vacation view advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware care careful caution communicating communication cycling cyclists disability disabled informing lookout observant path pathways pedestrians risks share sharing signs walk walkers walking warning watch watch-out