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 advice authority availability available blue checkered checks communicating communication law mobile mobility motor-bike motor-cycle on-duty order police police-only regulations responsibility responsible restricted restrictions road road-work security sign signs symbols transport transportation travel cutout cycles drive II world war isolated machine motorcycles old oldtimer second world war sidecar trike war wheels world war old motorcycle balance balancing business cambodia commerce delivering delivery eggs food fresh holding-on hotel moving quantities quantity risky stack stacking stacks support supporting tranposrt woman women work working aged american ancient antique chrome chromium classic collection Davidson fashioned fork Harley harley-davidson mechanical restoration restore restored retro revival shiny show steel style time tire veteran vintage wl activity adventure cycling day driver fast fun gloves life man motorbiker motorcycler motorized motorsport outdoors people recreational rider scene sky summer sunlight view access armed authorities badges barriers cars control deployment equipment flashing-lights law-&-order lights motor-bikes National-Day on-the-job patrols police-vehicles presence Singapore traffic traffic-control uniforms vehicles weapons