If the traffic is heavy,the bus may be late.这句话有语法错误吗?

The traffic is jam. The traffic is jam. If the traffic is heavy,the bus may be late.这句话有语法错误吗? Where is the policeman He ——（stop）the traffic on the highway. the traffic safety is first He is the only person __[活着的] in the traffic accident. what is the mean of “he was held up in traffic”? Bill was ___(严重地）hurt in the traffic accident.He is now in hospital. Although the traffic is not busy, he likes to drive at a _______ speed. He will even ride straight across a crossroads when the traffic light is red The traffic is heavy改为感叹句（）（）traffic! the traffic is heavy.（改为感叹句）_______ _________ traffic! If you're h______ ,have some bread.Wait for your t_______ to see the doctor.He went across the sIf you're h______ ,have some bread.Wait for your t_______ to see the doctor.He went across the street when the traffic l______ were green.The coat is made There is m____ traffic in the street There is a traffic ( ) on the road. the traffic is 为什么要heavy when the traffic light is red light在traffic is light中的意思有这么一句话：After your plane arrives,if the traffic is light,it'll only take fifteen minutes to get to the hospital from the airport by taxi.是不是畅通的意思?