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In the context of land transport systems, we are most resource efficient when we retain pavements and structures for as long as possible. This is achieved by re-using demolished pavement and structures, using recycled-content and low carbon materials where new materials are required, and by recovering discarded materials for use elsewhere.

Sourcing materials locally also reduces haulage and energy consumption. 

Examples of resource efficiency

The aim of Waka Kotahi is to enable and encourage each project and contract to assess and implement the resource efficiency opportunities that make sense within their context.

Examples of what we are doing:

Recycling materials

We allow the use of recycled materials in M/3, M/4, M/6 and M/10 pavement specifications. For example, our ‘Specification for basecourse aggregate’ (M4) allows use of recycled crushed concrete, recycled glass, and melter slag as base course materials.

The Newmarket Viaduct [PDF, 711 KB] project recycled 22,500 tonnes of recycled crushed concrete and 1,400t of steel. 

Reclaimed asphalt

Christchurch Southern Motorway project incorporated over 120,000 tonnes of recycled crushed concrete and 5,500 tonnes of reclaimed asphalt pavement (RAP) into the pavements. In addition, 66,000 tonnes of low-quality RAP was used in the embankment core fill.

Waste management planning

The MacKays to PekaPeka Expressway [PDF, 279 KB] project provides a useful example of a Resource Efficiency and Waste Management Plan.

Repurposing bridge structure

The Aotea Quay upgrade [PDF, 502 KB] successfully moved and repurposed an unused bridge structure.

LED lighting

We are moving to LED lighting with the ‘Specification and Guidelines for Road Lighting Design’ (M30).

Greenroads certification

Waka Kotahi requires all high value state highway projects over $15 million that are delivered via design and construction, alliance or public-private-partnership delivery models to seek Greenroads certification. Greenroads includes credits for resource efficient practices.

 

For further information contact environment@nzta.govt.nz