Wide centrelines are two lines marked in the centre of the road that keep opposing traffic further apart than standard centreline markings.
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.