Princes Highway and Hector McWilliam Drive intersection upgrade
Project overview
The NSW Government has committed $1.5 million to deliver a left turn slip lane at the Princes Highway and Hector McWilliam Drive intersection at Coila.

The intersection is an important link for residents and tourists as it provides the primary access to Tuross Head. This project aims to improve safety, efficiency and journey time reliability for all road users, particularly during peak holiday periods.
Project information
Background
Transport for NSW will deliver an intersection upgrade by installing a left turn slip lane with southbound acceleration lane on the Princes Highway to allow motorists exiting Hector McWilliam Drive to safely merge with southbound through traffic, improving safety and efficiency of the intersection.
Currently, motorists exiting Hector McWilliam Drive must enter the 100 km/h zone on the Princes Highway from a stop. Waiting for a safe gap to enter results in delays on this approach, impacting journey time reliability, particularly during peak holiday periods.
Objectives
- improve safety at the intersection for all motorists
- improve journey time reliability and efficiency for vehicles entering the highway from Hector McWilliam Drive.
Community information
Frequently asked questions
What will the intersection improvements include?
Work on the final design of the intersection upgrade is continuing; however, improvements will include:
- building a left turn slip lane with southbound acceleration lane from Hector McWilliam Drive onto the Princes Highway
- installing roadside safety barrier on the southern corner of the intersection, adjacent to the commuter carpark.
Why are we improving this intersection?
The intersection is an important link for residents and tourists as it provides the primary access to Tuross Head.
Currently, motorists exiting Hector McWilliam Drive must enter the 100 km/h zone on the Princes Highway from a stop. Waiting for a safe gap to enter results in delays on this approach, impacting journey time reliability, particularly during peak holiday periods.
When will the improvements be delivered?
Design work and site investigations for the improvements are progressing. Once finalised, work is expected to start early 2026 and take around 12 weeks to complete, weather permitting.
Transport will update the community when further details and construction dates are confirmed.
How will Transport minimise impacts during construction?
Transport will schedule construction to avoid peak holiday periods, with work to be carried out during the day on weekdays only to minimise impacts and disruptions due to the work.
Subscribe to stay up to date on the Princes Highway and Hector McWilliam Drive intersection upgrade project.
Contact us
For further information about this project, please contact:
Phone: 1800 555 638
Email: southprojects@transport.nsw.gov.au