carriageway

详细解释:n. 车行道
【法】 车道, 马路

英语解释：

名词 carriageway:

one of the two sides of a motorway where traffic travels in one direction only usually in two or three lanes

例句：

At that point, the road opens out and becomes a dual carriageway.公路在那个地方变宽了，变成了双车道。