Yellow box intersection trials

The problem

Vehicles stopping or queuing across an intersection can cause gridlock on the road network, not to mention the frustration caused to other drivers who are unnecessarily blocked and cannot move through an intersection. 

The solution

Yellow boxes are successfully used around the world to discourage drivers from stopping within intersections and blocking other vehicle movements. 

A yellow box is painted on the road to show the extent of an intersection and indicate an area where drivers should not stop.  You may only enter a yellow box intersection when your exit is clear and there is enough space on the other side of the intersection for your vehicle to clear the box completely without stopping.

Drivers who are turning right can stop at an intersection if their turn is prevented by oncoming traffic until it is safe for the turn to be completed.  Drivers must not simply follow the car in front through a yellow box as they must not enter the yellow marked area unless your exit from the intersection is clear. 

By discouraging intersection blocking, yellow boxes can help to improve traffic flow not just at the intersection but right through a road corridor.

When and where

In early 2016, two types of yellow box designs, using Singapore and UK markings, were implemented at the following locations (click on the images for a larger version)

The two types on trial were:

  • A large box with a single cross within a boxed intersection (Singapore markings)
  • A large box with hatching throughout the intersection (UK markings)

Both yellow box designs are currently being assessed to determine which line markings are most effective in reminding drivers not to stop within the intersection.

Further sites will be identified once it is determined which design works best.


Canning Highway and Kintail Road, Applecross


Queen Victoria Street and Tydeman Road, North Fremantle​


John Sanders Drive and Herdsman Parade, Glendalough​



Mitchell Freeway southbound off–ramp / Vincent Street / Leederville Parade, Leederville​


Last Updated: 02 May 2017