On a big road with grass, a wall, or a barrier down the middle, each side is a carriageway. All the cars on one carriageway go the same way; the cars on the other side go the other way.

On a big road with grass, a wall, or a barrier down the middle在一條中間有草地、圍牆或分隔島的大馬路上, each side每一側 is a carriageway就是一個carriageway。All the cars on one carriageway同一個carriageway上的車 go the same way都往同一個方向走; the cars on the other side另一側的車 go the other way則往反方向走。

This is a British word. Americans more often say roadway, or they just talk about lanes and the other side of the highway.

This它 is a British word是英式用語。Americans美國人 more often say比較常說 roadway roadway, or they just talk about或者只是講 lanes lanes and和 the other side of the highway highway的另一側。

A dual carriageway is the whole road: two carriageways, one for each direction, with something between them. A single carriageway is an ordinary road where traffic going both ways shares the same stretch.

A dual carriageway dual carriageway is the whole road指的是整條路: two carriageways兩個carriageway, one for each direction一個方向一個, with something between them中間隔著東西。A single carriageway single carriageway is an ordinary road則是一般的道路 where traffic going both ways shares the same stretch雙向的車流共用同一段路面。

Though actually, a carriageway is not one painted lane. It is the whole half of the road, and that half may have two or three lanes on it.

Though actually不過其實, a carriageway一個carriageway is not one painted lane並不是一條畫線的車道。It它 is the whole half of the road而是整條路的一半, and而 that half那一半 may have two or three lanes on it可能有兩條或三條車道。