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Displaying Page 4 of 64

Research Report 544 New Zealanders attitudes towards drug-driving and suggested countermeasures

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

This study conducted in New Zealand in 2012 investigated the attitudes, prevalence, habits and self-reported risks associated with drug-driving, along with possible countermeasures. Telephone and internet surveys were used for a general population sample. Face-to-face interviews, mainly in prisons, surveyed habitual users of four main drug types: alcohol and other drugs, cannabis, methamphetamine and benzodiazepine.

Research Report 571 Approaches to valuing injury and mortality risk in transport assessments

Published: | Category: Economic development , Research programme , Research & reports | Audience: General

This report describes a review of literature on approaches to valuing injury and mortality risk in transport assessments.

Research Report 337 Deterioration of prestressed concrete bridge beams

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

A routine inspection revealed significant corrosion of the prestressing strand on a concrete road bridge built in 1966 to a standard design used in about 117 State Highway bridges in New Zealand. To identify the cause of the deterioration and how many bridges of this design might be affected, the conditions of 29 similar bridges on New Zealand State Highways were evaluated by site investigation. The research, carried out in 2005–2006, found that although the concrete quality in the bridge beams was generally good, the combination of cover depths less than 25 mm and exposure to salt spray had increased the likelihood of corrosion in bridges of this design in the B2 (coastal frontage) exposure zone. Bridges in the B1 (coastal perimeter) and A2 (inland) zones are less likely to be affected, although the concrete in some of the beams contained chlorides added during construction.

Research Report 395 Enhancing the control of contaminants from New Zealand's roads: results of a road runoff sampling programme

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

This study provides guidance on vehicle emission factors (VEFs) for loads of copper and zinc discharged in road runoff, and the performance of stormwater treatment devices for removing these metals and total suspended sediments (TSS). Between February 2008 and June 2009, a field programme comprising the measurement of road runoff volumes and the collection and analysis of runoff samples was conducted at four sites, of differing traffic characteristics, in the Auckland Region. Concentrations of copper and zinc were higher at a congested site than at two sites at which traffic generally moved freely. Substantially lower TSS and metal concentrations were measured at a moderately congested site, counter to expectations and possibly reflecting the recent resealing of the road surface at this location with open-graded porous asphalt (OGPA). VEFs estimated using a contaminant accumulation/wash-off model provided the basis for determining a set of guideline copper and zinc VEF values for (1)...

Research report 452 Predicting walkability

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

This research provides a number of mathematical formulas for predicting the quality of the walking environment from the perspective of the user using operational and physical variables. The formulas were derived by combining the perception data gathered from participants in the community street reviews with measurements of the walking environment.

Research Report 346 The effectiveness of incident management on network reliability

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

This report summarises preliminary research undertaken in New Zealand during 2006–2007 to investigate the ability of intelligent transport system (ITS) treatments, such as adaptive signal control (eg, SCATS) and variable message signs (VMS), to detect and respond to serious traffic incidents, and to determine the most appropriate traffic management strategies (in terms of overall network reliability) to apply when such incidents are detected. The study involved a literature review of techniques and software/systems currently used to manage traffic congestion and respond to incidents, and an exploratory microsimulation study modelling incident detection and response in an urban network. The research found few attempts to bring together research in the three areas of incident detection/management, ITS methods such as adaptive signal control, and network reliability measures. There is also a lack of robust incident detection available at present in New Zealand.

Research report 403 The influence of surface treatments on the service lives of concrete bridges

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

The corrosion of reinforcing bars and prestressing steel is the most significant risk to the durability of concrete road bridges in New Zealand. The application of water-resistant surface treatments has been suggested as a means of delaying corrosion damage. This research, carried out between 2007 and 2010, reviewed international research findings and the use of preventive surface treatments by road-controlling authorities in Australia, the UK, and North America, to develop a guideline for selecting appropriate surface treatments for delaying chloride-induced corrosion damage on concrete road bridges in New Zealand. The findings indicated that the effectiveness of surface treatments for reducing corrosion activity and extending service life depends not only on the chemical composition of the treatment, but also on the condition of the concrete substrate, the application process, and environmental exposure conditions. A process was developed to identify the potential benefits of such surface treatments for individual bridges and for...

Research Report 461 Characterisation and use of stabilised basecourse materials in transportation projects in New Zealand

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

The stabilisation of near-surface granular pavement materials is accepted practice in transportation maintenance and capital development projects in Australasia. Stabilisation in this context involves the mechanical introduction of reactive agents, including cement and foamed bitumen, into existing or manufactured granular materials, with or without existing seal inclusion.

Research Report 305 Adaptation of the AUSTROADS pavement design guide for New Zealand conditions

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

New Zealand granular pavement design is currently based on the assumption that all deformation of the pavement shape under traffic loading occurs in the subgrade. To reflect this theoretical behaviour the AUSTROADS document Pavement design – a guide to structural design of road pavements (AUSTROADS 1992) is based on limiting the vertical strain on the subgrade. AUSTROADS (1992) was adopted as a design methodology by New Zealand in 1996. In 2004 a newer version of the AUSTROADS guide was issued (AUSTROADS, 2004a) and this document is now the current pavement design guide in New Zealand. Just as with the 1992 document AUSTROADS (2004a) continues with the design methodology of minimising the subgrade strain according to the design traffic. This study, initiated in 2004, examines the design methodologies presented in AUSTROADS and evaluates them against available New Zealand research. Various subgrade strain criteria are examined for New Zealand conditions.

Research Report 362 Incorporating sustainable land transport into district plans: discussion document and best practice guidance

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

This report is a discussion document introducing the concept of sustainable land transport, discussing the interaction between land use planning and sustainable transport, and introducing some guidance to incorporating sustainable land transport into district plans. It will assist local authorities when reviewing district plans, and assessing resource consent applications and notices of requirement. The content of the discussion document includes definition of a sustainable land transport system, issues facing sustainable land transport systems in New Zealand, options to address these issues, and provisions that could be included in district plans. Model provisions for best practice are included, along with a checklist of rules that could be included in district plans.