Read the following sign or notice and mark the letter A, B, C, or D to indicate the correct answer t...Đoạn văn24/40What does this sign mean?Opening trafficSeparate-way trafficTwo-way trafficUp-down trafficGiải thíchBiển báo có ý nghĩa gì? Chọn C. Two-way traffic: Đường hai chiều