road hog

US /ˈroʊd ˌhɑɡ/
UK /ˈroʊd ˌhɑɡ/
"road hog" picture
1.

a driver who takes up too much room on the road or prevents other vehicles from passing

:
That road hog was driving in the middle of two lanes.
He was fined for being a road hog and causing congestion.