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Research Report 458 A social responsibility framework for New Zealand's land transport sector

Published: | Category: Sustainable land transport , Research programme , Research & reports | Audience: General

Since the implementation of the Land Transport Management Act 2003, public sector land transport organisations in New Zealand have had the obligation to be socially and environmentally responsible, either as one of their organisational objectives (NZ Transport Agency) or in terms of the activities and combinations of activities approved for payment from the National Land Transport Fund (regional councils and road controlling authorities), While most organisations had a strong sense of what was meant by environmental responsibility, less was known about what was required to be socially responsible.

Research Report 515 - The effect of rainfall and contaminants on road pavement skid resistance

Published: | Category: Environmental impacts of land transport , Research programme , Research & reports | Audiences: Communities, General

This research project, which was undertaken between 2003 and 2006, aimed to improve the understanding of the effect that environmental factors (eg rainfall and detritus) have on the variation of measured skid resistance, both in the short and longer term. Phase 1 of the research was a field study of seven sites in the Auckland and Northland regions over 2.5+ years, with regular skid resistance measurements primarily utilising the GripTester. Phase 2 involved developing a new laboratory-based accelerated polishing device and methodology for testing large (600 x 600mm) chipseal surfaces with the Dynamic Friction Tester.

Research Report 344 Personal security in public transport travel in NZ: problems issues and solutions

Published: | Category: Safety, security and public health , Research programme , Research & reports | Audience: General

This research project explores concerns about personal security by users of public transport. The findings from an international literature review are used, and the concerns of public transport users in three New Zealand cities (Auckland, Wellington and Christchurch) that have significant public transport patronage streams are explored. Personal security concerns were found to discourage existing patrons from using public transport, and more so after dark. A number of security measures preferred by patrons are outlined. However, the project also found that only a small proportion of patrons actually noticed the presence of security measures that had been installed.

Research report 401 Rationalisation of the structural capacity definition and quantification of roads based on falling weight deflectometer tests

Published: | Category: Activity management , Research programme , Research & reports | Audience: General

Pavement performance modelling for New Zealand roading networks, currently relies on an adjusted structural number (SNP) which is a single parameter intended to describe the performance of a multi-layered pavement structure in terms of its rate of deterioration with respect to all structural distress modes, as well as non-structural modes. This parameter had its origin in the AASHO road test in the late 1950s, before the advent of analytical methods. Hence refinement to keep abreast of current practice in pavement engineering is overdue. This research describes the basis for a new set of structural indices and how these can be used to obtain improved prediction of pavement performance: both at network level and for project level rehabilitation of individual roads. The results are (i) effective use of all the data contained in RAMM, (ii) more reliable assignment of network forward work programmes, (iii) reduced cost through targeting only those sections...

Research Report 517 Use of roadside barriers versus clear zones

Published: | Category: Safety, security and public health , Research programme , Research & reports | Audience: General

This report summarises research carried out in 2011–12 to quantify the effects of roadside barriers and clear zones on mitigation of run-off-road crash numbers and crash severity for New Zealand road and roadside characteristics through statistical and computer simulation modelling. The purpose of the research was to provide practitioners with information that would allow them to make safe, more appropriate and cost-effective treatments for specific conditions.

Research Report 335 Performance tests for road aggregates and alternative materials

Published: | Category: Activity management , CAPTIF , Research programme , Research & reports | Audience: General

Aggregates used as base materials in thin-surfaced granular pavements common to New Zealand contribute at least half the wheeltrack rutting and roughness seen at the surface. Currently, no reliable cost-effective measure of an aggregate’s resistance to rutting in specifications exists. Several test methods using the repeated load triaxial (RLT) apparatus were investigated for use in specifications for basecourse aggregates. Rut depth prediction methods and pavement finite modelling were applied to the RLT results to determine traffic loading limits for the aggregates tested. It was found that the average slope from the six-stage RLT test was the best predictor of traffic loading limit and this test was recommended for use in basecourse specifications.

Research Report 393 Relative costs and benefits of modal transport solutions

Published: | Category: Environmental impacts of land transport , Research programme , Research & reports | Audience: General

This report describes the outcomes of a study commissioned by the NZ Transport Agency to inform local authorities about the costs and benefits of transport modes. The aim of the study has been to provide general advice on the relative cost and benefits of alternatives with a focus on passenger transport in urban areas.

Research report 450 Evaluation of the value of NZTA research programme reports to end users

Published: | Category: About the research programme , Research programme , Research & reports | Audience: General

This evaluation assesses how valuable the findings of NZ Transport Agency research reports, published from 2005 to 2009, have been for end users in New Zealand. The evaluation also identifies the barriers and enablers that make the difference between successful and less successful uptake and use of findings from the research reports, and the extent to which current Transport Agency mechanisms for disseminating and promoting research findings represent the best possible use of available resources.

Research Report 508 Improvement of the performance of hotmix asphalt surfacings in New Zealand

Published: | Category: Activity management , Research programme , Research & reports | Audience: General

This research project had the objective of identifying areas where changes could be made in the use of thin layers of asphalt so that improvements in performance could be obtained. The project was not designed to investigate quality issues, but was to concentrate on materials and selection. The project was initiated because the NZ Transport Agency had found that costs of resurfacing using asphalt had escalated and the lives being achieved appeared to be short. This research in this report, which was undertaken between 2007 and 2012, investigated the following areas:

Research Report 347 Characterising pavement surface damage caused by tyre scuffing forces

Published: | Category: Activity management , Research programme , Research & reports | Audience: General

The transverse shear forces generated by multi-axle groups depends on many factors including turn geometry, vehicle type, axle weights, tyre size and configuration, suspension geometry, and the number and type of axles. This study quantifies the impact of some of these parameters on the transverse pavement shear forces or scuffing forces generated during constant low-speed turns. A field trial on an unbound granular pavement structure with chipseal surfacing assessed the level of scuffing force that caused visible wear on the pavement surface. A computer model of a tandem simple-trailer was used to simulate the forces observed in the field. Computer models were used to assess the effects of axle load, axle group spread, wheelbase, and turn geometry on peak scuffing forces; to simulate various low-speed turns; and to identify the relative impact of the peak scuffing forces for the different vehicles.