Wide centrelines are two lines marked in the centre of the road that keep opposing traffic further apart than standard centreline markings.
Two yellow lines are in the middle of the road create a wide centre line, with cars driving on either side of the lines

Example of a wide centreline on a rural road

Widening the centreline means more space between you and oncoming vehicles. It’s a simple and effective way to visually create more space between vehicles and can help prevent a potential crash if someone makes a mistake.

They’re typically used on rural roads and are often used to prepare for the potential future installation of a median barrier, where there are changes in traffic growth or crash risk.