asphalt barrel build building bulldozer caterpillar construction dig digger excavator lay machines not ready road roller steam track work ahead blue germany pole post posts red sign signpost signposts signs sky steel sundtraffic traffic warning white avenue brasil brasilia brazil city cone danger man metropolis orange orientation signal street transit urban way barn brown clouds country farm green Ohio quilt rural summer Tan trees whitewash wild flowers yellow advice authority availability available checkered checks communicating communication law mobile mobility motor-bike motor-cycle on-duty order police police-only power regulations responsibility responsible restricted restrictions road-work security symbols transport transportation travel vehicle action autobahn autoweg camion car cars direction dynamic highway motorway move moving path race racing route speed speeding swoosh truck trucker truckers trucks Automotive lighting electricity graphic homeward bound landmark leaving work lights Mode of Transport night reflections rush hour skyscraper traffic density boom bucket cutout dig hole equipment heavy equipment holes house isolated no backgroud rotating platform angled Australian buildings compacting compactor diesel diesel-driven display displayed doesel-motor engine flatten flattening heavy heavy-duty historic historical history machinery mechanical metal motor old railway-line township vegetation vintage wheels