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Displaying Page 6 of 66

Research Report 259 Relationship between design and predicted performance of New Zealand pavements

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

Both the design of new pavements in New Zealand and their rehabilitation treatments are currently performed in accordance with the Austroads Pavement Design Guide and its New Zealand Supplement. New Zealand is also adopting pavement deterioration modelling based on the World Bank HDM models. This report demonstrates how the modelling of roughness progression can supplement this pavement design. Keywords: Austroads, CIRCLY, database, design, HDM III, modelling, New Zealand, pavement, pavement design, performance, road

Research Report 325 The effect of grading on the performance of basecourse aggregate

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

A laboratory study was undertaken to determine the effect of grading/particle size distribution on permanent deformation in multi-stage repeated load triaxial (RLT) tests. Results showed the coarse gradings with a Talbot’s exponent n-value of 0. 8 had the least amount of permanent deformation for high-moisture contents near saturation. Finer gradings with an n-value of 0. 3 had the least deformation in all of the tests in dry conditions at less than 70% of optimum moisture content. Similar performance in terms of permanent deformation was obtained if variations of the n-value were less than 13%. Based on limiting the variations in n-value to ± 13% new grading envelopes for use in the new Transit New Zealand specification for RLT testing were proposed.

Research Report 324 Evaluating the network condition changes of transit networks managed under PSMC procurement options

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

Performance specified maintenance contracts (PSMC) have been operational in New Zealand for more than six years. These contracts are driven by key performance measures (KPMs) that are used to define the expectations of the road agencies and monitor the progress and performance of the contractor. As the effectiveness and efficiency of the KPMs is vital for achieving the desired results, it is essential to examine the effectiveness of the current KPMs in controlling and directing the maintenance contracts. The report examines the interpretations of the collected data using average and mode. The poor representation of the total network condition by the traditionally used average is illustrated by numerous examples. Alternative representation of the network condition is proposed and illustrated by using the mode of the data set.

Research Report 039 System-wide road accident analysis

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

A comparison of the road accident rates between five cities in New Zealand was undertaken between 1989 and 1991. Accident data from these cities were coded onto validated road networks prepared for transportation studies. Accident rates have been calculated using accident data and modelled traffic volumes, and significant differences in accident rates are apparent. To determine the correlation between traffic volume and accident rate within the road classes and intersection types, detailed regression analyses were applied to the five cities. The analyses were also used to identify outliers (locations with significantly higher or lower accident rates than usual) and thus identify accident 'black spots'. They can be used to estimate costs of accidents for inclusion in economic evaluation of projects, to ensure that proposals to change a traffic or road system, or to employ an accident reduction measure, will be the most economically effective.

Research Report 389 Cycle safety: reducing the crash risk

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

Cycling is a sustainable mode of travel and an alternative to motor vehicle trips, particularly for shorter trips. However, the risk of crashing while cycling is typically higher than while travelling in a motor vehicle. To create a safer environment for cyclists, traffic engineers and transport planners can select a number of safety countermeasures. These include changes to the road layout, such as reducing traffic volumes and speeds; installing cycling lanes and paths; and conducting enforcement and education programmes focused on drivers and cyclists. The crash benefits to cyclists of reducing traffic volumes and speeds, and constructing cycle lanes and intersection treatments have been investigated during 2006 and quantified based on overseas research and data collected within Christchurch, Palmerston North and Nelson. It was found that cycle lane facilities provided a reduction in cycle crashes of around 10%.

Research Report 453 Trips and parking related to land use

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

The objective of the research detailed in Transfund NZ research report 209 was to produce a comprehensive national database of information on trips and parking related to land use in New Zealand and to identify historic trends since the 1970s. This research has revised the original report, updating it to 2010 and comparing New Zealand results with those reported in the UK, USA and Australia. It also reviews trip generation surveys and databases from these four countries. The research indicated a general equivalence and consistency in the travel patterns seen in New Zealand to those reported in UK, USA and Australia. Drawing on parallel research based on the MoT New Zealand Household Travel Survey, there is a chapter devoted to daily trips by all modes and purposes.

Research Report 052 Unsealed road condition rating system for RAMM: literature review

Published: | Category: Integrated land use and transport systems , Research programme , Research & reports | Audience: General

International literature on unsealed road condition rating systems was reviewed in 1993-94, with the objective of recommending to Transit New Zealand a system suitable for use on unsealed roads in New Zealand. The present rating system used in New Zealand is the RAMM Standards and Guidelines Part II: Unsealed Road Condition Rating Standards:, Issue 1, May 1994. This system, with some modifications, is recommended as still being appropriate for unsealed roads in New Zealand. Keywords: Literature, New Zealand, RAMM, rating systems, review, roads, unsealed roads

Research Report 076 Design traffic data for the NZ supplement to the Austroads pavement design guide

Published: | Category: Integrated land use and transport systems , Research programme , Research & reports | Audience: General

The report presents a background to the design traffic data included in the New Zealand Supplement to the AUSTROADS Guide. Data collected by Transit New Zealand's Weigh-in-motion Stations has been analysed and manipulated to provide New Zealand-based data suitable for inclusion alongside the Australian equivalent provided in Tables E4 and E5 of the guide. Keywords: Design traffic, AUSTROADS pavement design, axle loads, axle configuration, New Zealand supplement

Research Report 075 A framework for an ideal road structures design manual

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

The report presents a definition of the scope and coverage of an ideal manual for the design of roading structures to meet the needs of Transit New Zealand and compares the present Transit New Zealand Bridge Manual and the 1992 Austroads Bridge Design Code with each other and the ideal manual. Recommendations are made on which document to adopt as the basis for future development of a roading structures design manual, and on the adoption and development of criteria for revision of the manual. Keywords: Bridge, code, manual, road structure

Research Report 260 Integrated stormwater management guidelines for the New Zealand roading network

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

These guidelines for integrated stormwater management provide guidance on a range of issues relating to the management of stormwater run-off from state highways and local roads in New Zealand, including:

the legal framework within which stormwater management takes place
the management framework (agency responsibilities and management tools)
the gaining of resource consents for stormwater management activities
environmental effects and mitigation measures
best practice engineering methods. Keywords: compliance, design, drainage, environment, erosion, flooding, hydrology, legislation, maintenance, management, mitigation, monitoring, New Zealand, resource consents, Resource Management Act, run-off, sedimentation, stormwater