south,南方的，bound,朝向。

1. Southbound traffic tailed back for twenty miles on the M5 near Bristol.

在布里斯托尔附近的5号高速公路上，南行的车辆排成了绵延20英里的长龙。

2. the southbound carriageway of the motorway

高速公路的南向车行道

3. The accident happened on the southbound carriageway of the M 1.

车祸发生在M1公路的南行车道上.

4. The north and southbound roadways are each ( 15 . 85 m ) wide with two ( 1 . 52 m ) sidewalks .

南北走向的公路每个方向道宽 15.85m,带有两侧各 1.52m 的人行道.

5. American officials have begun searching southbound traffic and seizing illicit cargo.

美国官员已经开始搜寻南部的毒品网络并扣押非法物资.