ahead block blocked construction constructions detour diversion road roadsign roadsigns sign signs turn works decay water wet control directions do not instruction restriction safety temporary traffic car map maps roads streets traffic sign transport transportation black closed closed road sign direction message obstacles redirection road sign warning yellow boom bucket crawler crew equipment excavator fix heavy equipment hydraulics loader maintenance pipe repair replace track workers blockage cutout isolated lamps lights platform trailer alert alternative-way announcement arrow be-careful beware blocked-path care careful caution communicating communication danger directing discoloration go-around informing lookout observant observe pedestrians security watch watch-out wording words