a road hog

road hog

A driver who takes up too much space on the road, making it difficult or impossible for other drivers to pass. Many morning commuters became frustrated at the road hog straddling two lanes.
See also: hog, road

a ˈroad hog

(informal, disapproving) a person who drives in a dangerous way without thinking about the safety of other road users
If you hog the road, you drive so that other vehicles cannot pass.
See also: hog, road