Major contractor opens Australian first Diverging Diamond Interchange

The Bruce Highway’s Caloundra Road interchange is being transformed into a Diverging Diamond Interchange (DDI) with the first stage open to traffic on 28 November 2019.

A DDI temporarily shifts traffic to the right side of the road, allowing both through-traffic and right-turning traffic to proceed through the intersection simultaneously.

Seymour Whyte, in a joint venture with Fulton Hogan, is delivering the project. Will MacDonald, Seymour Whyte Regional Manager – Northern, said the first stage traffic switch is a major milestone for the project to expand capacity and improve travel times for road users.

The DDI’s design minimises the project footprint as it requires less bridges and roads, while enhancing capacity.

The DDI at Caloundra Road will be opened in stages over the next 12 months to fast-track construction works. East and westbound travel will change at the Caloundra Road interchange. These are the first two stages of the DDI opening and are expected to occur within a two-week period.

The interchange is also expected to improve road safety by reducing the number of crossing conflict points, compared to traditional interchanges, which have right-turning lanes in the middle of the road.

The DDI will allow motorists to turn right without giving way to, or blocking traffic, coming the other way. Synchronised traffic signals, line marking and signage will guide motorists  through the interchange and towards their destination.

The Bruce Highway upgrade – Caloundra Road to Sunshine Motorway project is being delivered by a Fulton Hogan Seymour Whyte Joint Venture.


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