attention bollard building danger road sign under construction warning city concrete constructing construction gray industrial outdoor outside pavement paving promenade street tile tiles urban work workplace barrel build bulldozer digger excavator machines roller steam bridge iron river dig industry machine architecture mediterranean villa white cone repair threat transportation warring ahead block blockage blocked constructions cutout detour diversion isolated lamps lights platform roadsign roadsigns signs trailer turn works orange square sundtraffic traffic us usa duty equipment flatten heavy rollers steamroller