KwaMashu Interchange, South Africa

The original KwaMashu interchange carried high volumes of traffic in all directions, resulting in extreme congestion throughout the day, with queue back-up extending onto the N2 northbound carriageway for several kilometres.

Aurecon was involved in the pioneering conversion of the standard diamond KwaMashu interchange to an innovative diverging diamond layout has provided a low cost, effective means to enhance interchange capacity and safety. It has improved capacity on the interchange and significantly reduced traffic and pedestrian conflict points, with a consequent reduction in accidents and a complete elimination of right-angled accidents.

It is the first application of a diverging diamond interchange (DDI) in the southern hemisphere and for left-hand drive.

The introduction of the DDI concept for the KwaMashu interchange upgrade was successfully commissioned in June 2013.

In 2014, the project won a Consulting Engineers South Africa (CESA), AON Engineering Excellence award and a South African Institution of Civil Engineering National Project award.

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