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A prioritisation scheme for the safety management of curves (curve risk analysis)

Published: 2011

This paper is for skid resistance practitioners to assist them with background to the T10 Skid resistance investigation and treatment selection policy on curves.

Note: Publishing this paper on the NZ Transport Agency website does not imply agreement with details in the paper.

Chipsealing in New Zealand and Practice notes for chipsealing in NZ

Published: 2005; 2011

Chipsealing in New Zealand is a distillation of information from at least 80 years experience in New Zealand, compiled by chipsealing experts from throughout New Zealand. Many years of experience based on research and backed up by references have contributed to this book.

High speed data collection programme

Each year, between October and March, we survey the condition of our highways. We do this using a specialist vehicle called SCRIM+ (Sideway-force Coefficient Routine Investigation Machine). SCRIM+ collects data on a range of condition aspects, which allows us to respond to any arising maintenance issues and helps ensure road users continue to travel safely.

2008 Skid resistance survey data (2008 exception report advice) (TM5004)

Published: 2009

The 2008 SCRIM survey was an outlier. This memo describes actions to be taken that are unique to the 2008 survey.

Use of reclaimed tyre rubber in asphalt (TM6001)

Published: 2006

This report identifies possible methods and constraints on the use of waste tyre rubber in asphalt in New Zealand. There are two main methods: Wet process - ground tyre rubber (GTR) is first combined with the asphalt binder and can produce asphalt with superior properties; and Dry process - the GTR is used to replace a fraction of the aggregate and does not appear to offer any performance enhancement.

Binder and hot cutback binder, chipseal life and usage analysis

Published: 2014

This report contains an analysis of the attained life of certain chipseal resurfacing types. It is a follow up to a presentation at the NZ Transport Agency/NZIHT 14th annual conference in November 2013, presented by Joanna Towler on emulsion versus cutback chipseal lives.

This report was produced by David Wanty, Wanty Transportation Consultancy.

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