An overtaking lane is the lane furthest from the shoulder of a multi-lane carriageway/roadway (sometimes called the fast lane, although this is deprecated by the authorities), i.e. the leftmost lane where traffic drives on the right, or the rightmost lane where traffic drives in the left. The slow lane is the lane nearest to the shoulder of a multi-lane carriageway/roadway, i.e. the farthest from the overtaking lane. These usages lead to the phrases life in the slow lane and life in the fast lane, used to describe relaxed or busy lifestyles, respectively and used as the titles of various books and songs.