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“At Road Science, we’re aiming to challenge, through thinking outside the square, what can be advanced, and move away from reliance on handed-down common knowledge. And that means backing up everything we develop with facts, figures and scientific rigour.” Most of Road Science’s business involves surfacing and maintaining the public network. You’re on Road Science surfaces on Dunedin’s Caversham motorway; Hamilton’s new ring road; Christchurch’s Riccarton bypass; and the Auckland motorway link between State Highways 1 and 20 at Manukau. Most New Zealand roads – about 90% – are made of granular bases compacted and then sealed with bitumen-based chipseals. Asphalt, which costs more, involves mixing aggregate and bitumen in a dedicated asphalt-manufacturing plant, which is then laid by a paving machine and rolled; it’s used on just 10% DOWNER / IN BLACK & WHITE / 37


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