関連ワード:  what is a dual lane carriageway    what is a two lane carriageway    what is a two lane carriageway singapore    what is a two lane dual carriageway    what is a dual carriageway road    what is a dual carriageway road uk    what is a three lane dual carriageway    what is a single lane dual carriageway    what is a slip road dual carriageway    what is the outside lane on a dual carriageway