The underpass, currently used by pedestrians and cyclists, will allow buses to move passengers to and from the shopping centre without having to enter a busy North Lake Road, often backed up at the traffic lights.
City engineer John McDonald said the upgrade would be a welcome addition to the development of Cockburn Central.
‘The upgrade to the underpass will complement the rest of the vision,’ he said.
‘It will allow for a vibrant, pedestrian-friendly access area to complement the vibrant town centre across the street.
‘Around 40,000 vehicles a day access Beeliar Drive currently so any relief from buses to the busy intersection will help ease congestion and improve public transport.’