3-D alert appropriate-behavior appropriate-behaviour area attention banned cigarettes communicating communication danger direction directive distinctive environment eye-catching glassy health health-risk lettering location no-smoking not-allowed not-permitted permission-denied plastic pollution prohibited prohibition raised semi-transparent sign style surface surfaced surfaces surfacing symbol tactile texture textured textures thick thin unhealthy warning wording words authorised restricted risk beware blue careful caution child conduct control course drive guide happen highway industry kids law limit Look pedestrian pedestrians people playground playing protection respect road school sidewalk slow street teen traffic transportation walk way zone Dirt grasses leaves spider stems yellow ash boiling brown Dead trees gray hot springs mountains orange water white yellowstone green hot mountain pine trees bushes clouds fire forest grass lookout metal silver sky summer tower watch Wildfires boardwalk Tan trees Australian edges flora foliage leaf leafed light pain Prickly protective shrubs spikes spiky spines animal animals announcement be careful black camel camels car care cars driving informing mammal observant observe reflective safety security vehicles watch out