Caves Road and Cape Naturaliste Road Roundabouts


A project to improve safety at the intersection of Caves Road and Cape Naturaliste Road in Dunsborough is now complete. The new roundabouts were opened to traffic by the Minister of Transport and Member for Vasse, the Hon Troy Buswell, on 29 November 2013.

The project involved construction of two new roundabouts at the following intersections:

  • Caves Road and Cape Naturaliste Road
  • Cape Naturaliste Road and Dunn Bay Road

Further information about the project is contained in the following project publications:



Around 5,000 vehicles per day use the intersection of Caves Road and Cape Naturaliste Road in Dunsborough, and this figure increases during the tourist season. The community has raised concerns about the performance of this intersection, which has consistently recorded crashes in the past five years involving cars turning right conflicting with through traffic on Caves Road. So far, no fatalities have occurred, but nearly half of the crashes have required medical treatment or hospitalisation.

Following an assessment of six options to construct either a roundabout or traffic signals at this site, Main Roads developed the preferred roundabout option, which was chosen because:

  • Unlike traffic signals, the potential for right-turn through crashes at the roundabouts is virtually eliminated.
  • A roundabout fits more closely with the existing road environment, and this option provides the best geometric solution of the four roundabout options considered.
  • It improved the road network by managing traffic at the Dunn Bay Road intersection.
  • Unlike traffic signals, it won't result in forced stops during non-peak periods.
  • Access was maintained for all stakeholders.
  • It minimised impacts on heritage sites.
  • Disruption to traffic during construction was reduced compared with other options as most of the work was offroad.
  • The City of Busselton can use the roundabout as an entry statement to Dunsborough.


Scope of Works and Managing Impacts

The project involved pre-construction works including: survey and design, land acquisition, clearing and fencing, service relocation and geotechnical investigations.

Construction works included earthworks, drainage, pavement construction, sealing and asphalt, line marking and signage, street lighting, footpath relocation, and landscaping and rehabilitation.

A significant amount of environmental work was done in close consultation with the Department of Parks and Wildlife (formerly the Department of Environment and Conservation) and the Department of Sustainability, Environment, Water, Population and Communities (SEWPAC). We managed a number of social, environmental and economic impacts as the project progresses.



  • An expected reduction in the crash rate and severity of crashes.
  • Reduced delays through an increase in intersection efficiency.
  • Safer access and egress to and from Dunsborough.
  • Landscaping to improve the amenity of the area.
  • Minimal impact on cyclists and pedestrians with existing shared paths reinstated.


Modified: 27 Feb 2018