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Research Report 141 Selection of cost-effective skid resistance restoration treatments

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

This report presents a suggested procedure for selecting the economically optimum treatment for restoring the skid resistance of an existing road surface when it is found to be deficient. A table of attributes for 15 skid resistance restoration treatments identified as being suitable for application to New Zealand road surfaces. The economic appraisal procedure showed that application of skid resistance restoration treatments can substantially reduce crashes yielding benefit-cost ratios in the thousands. In general, applying a new surface was found to be more cost effective than treatments involving the modification of an existing surface such as grooving, bush hammering and waterblasting. However, high pressure (>1000 psi) waterblasting appears to hold considerable promise for temporarily increasing skid resistance by 0.05 to 0.1 MSSC units.

Research Report 200 Evaluating the quality of road survey data

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

This report describes the results of a project to investigate the quality of road survey data collected from road networks in New Zealand. The objective was to establish a statistical technique which could be used to identify whether data were inconsistent with data from previous years' surveys. Seven databases were assembled with data in the format suitable for time series analyses from different road controlling authorities. This proved to be a complicated process due to problems with how the data were stored and referenced. The data were evaluated on 100-m road sections and major variations in condition between years were found which could not be ascribed to pavement deterioration. In many instances these were due to maintenance applied to the pavement that was not always recorded in the databases. The roughness data were considered to be the most suitable for time series analysis, and they were analysed using a Box-Jenkins...

Research Report 258 Detailed experimental investigation for foamed bitumen stabilisation

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

As the demand for a cost-effective and environmentally friendly pavement stabilisation method increases, so has foamed bitumen stabilisation for unbound granular pavement layers started to gain broad acceptance worldwide.

Research Report 317 ITS environmental monitoring and forecasting: international trends and experiences

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

The purpose of this project was to review the use overseas of environmental monitoring and forecasting systems as a component of wider-integrated ITS facilities, in particular those linked to transport and traffic management, and to consider their potential for New Zealand. It also aimed to provide direction from overseas best practice on the use of these systems to monitor, forecast and manage the adverse environmental effects of New Zealand traffic. Through evaluation of these systems this research intended to highlight the benefits that could be achieved through an improved ability to plan and manage traffic on the basis of accurate and reliable environmental data. It also planned to provide better information on the adverse effects of traffic on the environment, especially through air and noise pollution, leading to better targeted mitigation strategies (short and longer term).

Research Report 374 Comparisons of NZ and UK trips and parking rates

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

Trip generation, parking demand, modal split and travel activity related to different land uses are fundamental information for transportation planning and land use planning, now and in the future. While trip generation related to residential, business, tourism, recreation, industry and rural activities has been investigated, these areas have not always been surveyed or analysed consistently or reported in sufficient detail to provide transportation professionals with a robust assessment for planning and design purposes. This investigation sought to establish whether trip making and parking demand were similar between similar land uses in New Zealand and the United Kingdom. The conclusion is that travel patterns over a wide range of land uses, and especially those related to retail shopping centre activities, are similar in both countries.

Research Report 431 The mechanisms and types of non-motor vehicle injuries to pedestrians in the transport system and indicated infrastructure implications

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

Research carried out in 2008-2010 examined the quantum and causes of non-motor vehicle injuries to pedestrians through a structured interview survey. Pedestrians sustaining injuries in locations away from the road network (eg in parks) were excluded, as the emphasis was on the role of road and footpath features. The highest proportion of trips and falls (34%) was sustained while stepping over a kerb. A further 18% were caused by irregularities in the path or road surface. Factors that amplified the severity of injuries included the road or path surface, pedestrians' inattention, type of footwear worn, and whether walking or running. Two main issues were identified from the study. These were:

Research Report 049 Assessment of torsional braid analysis technique for polymer-modified bitumens

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

Modified bituminous materials can be used to advantage on roads that are subject to high stress, such as on heavily trafficked sections, sharp bends, and bridge decks, or to wide variations of temperatures. Addition of polymer to bitumen improves the visco-elastic properties by increasing the resistance to permanent deformation at high stresses and temperatures. To encourage more accurate road surfacing design in New Zealand, accurate reproducible measurements of the mechanical properties of both unmodified and polymer-modified bitumens are needed.

Research Report 054A National traffic database - research report

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

The National Traffic Database (NTDB) is a system for storing traffic data on each of approximately 120,000 sections of New Zealand public road network (state highways and local roads). It incorporates data collected by each Road Controlling Authority (RCA), ie by Transit New Zealand Regional Offices for state highways and by each Territorial Authority (TA) for local roads. The road sections are as defined in the RAMM (Road Assessment and Maintenance Management system) databases of each RCA.

Research Report 098 Monetary valuation of intangibles – literature review and pilot surveys

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

Literature on the monetary valuation of the environmental effects of roads and road traffic on adjoining residential land use is reviewed. The application of an hedonic pricing method linking house price differences with traffic noise disturbances is explored for an Auckland suburb. It is concluded that more detailed information on property characteristics, traffic flows and noise exposure and more advanced multivariate analysis would be needed to progress this technique further. However, the literature review leads to a recommended indicative value for traffic noise disturbance of 0.4 to 0.5% of house value per 1 dBA increase in the energy mean sound level (Leq).

Research Report 596 Understanding trends in roadside air quality

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

The primary aim of this research was to improve the understanding of how vehicle emissions are trending over time in New Zealand and how this relates to observed trends in local air quality.
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