construction cutout flatten isolated machine roadwork roadworks roller rollers steam steam roller barrier block blocks buildings city closed dumper dusseldorf flats lights office road shops street town lorru traffic traffic lights truck fence crossing junction lamp streetlamp area backdrop black building copy copyspace danger emergency graphic hazard illustration.background industry restricted restriction roadside rust safety security sign site space wallpaper warning yellow caution slow workers workman workmen asphalt drive labor labour man operator steamroller working be-prepared to stop readiness ready road-sign slow-down