thOng dang khai that va trong qua trinh thi cong, nang cap, baci tri, saa chira. Thiet 1'0 tr4t to an toan giao thong do thi: To chirc giao thOng khoa hoc, hop ly, phu hop voi co so ha tang giao thOng do thi; diL chinh chu ky den tin giao thOng phu hop voi luu luong ...