Spring cleaning mainly involves cleaning calcium chloride sprayed during winter snow removal and accumulated fine dust. Drainage channels, collection dredging, drainage gutters, and expansion joints are cleaned at night to remove foreign substances deposited in road facilities along with cleaning tunnels, underground roads, soundproof walls, streetlights, and lamps. For the safe operation of citizens, road… Seoul Metropolitan Facilities Corporation cleans 12 motorways for spring…Controlling the night to dawn part of the morning 계속 읽기