Skip to content

Access keys for

  • h Home
  • m Menu
  • 0 Show list of access keys
  • 2 Skip to content
  • 3 Skip to top


Filter by:

Results for *

Sort by: Relevancy | Date | Title

Displaying Page 1 of 9

Research Report 103 Use of rumble strips as warning devices on New Zealand roads

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

A review of the international literature was undertaken in 1994 to identify the types of rumble strip available, situations where and how they are used, their effectiveness in reducing accidents and modifying driver behaviour, their adverse effects such as noise, and their expected service life. The available information was then interpreted to identify the suitability of rumble strips for New Zealand roads, the materials that might be employed and the cost of installation. As well issues which would need to be resolved by further research are recommended.

Research Report 349 Distractive effects of cellphone use

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

The research systematically compared the driving performance and conversational patterns of drivers speaking with in-car passengers, handsfree cellphones, and remote passengers who could see the driver’s current driving situation (via a window into a driving simulator). Driving performance suffered during cellphone and remote passenger conversations as compared with in-car passenger conversations and no-conversation controls in terms of their approach speeds, reaction times, and avoidance of road and traffic hazards. Of particular interest was the phenomenon of conversation suppression, the tendency for passengers to slow their rates of conversation as the driver approached a hazard. On some occasions these passengers also offered alerting comments, warning the driver of an approaching hazard. Neither conversation suppression nor alerting comments were present during cellphone conversations. Remote passengers offered some alerting comments but did not display conversation suppression. The data suggested that conversation suppression is a key factor in maintaining driving performance and that visual...

Research Report 079 Road environment and traffic crashes

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

This report presents a road geometry survey of the New Zealand highway system and the subsequent use of the data to model the relationship between highway features and relative crash risk. The Australian Road Research Board's RGDAS (Road Geometry Data Acquisition System) survey vehicle was used in 1992, to survey the geometry of all of New Zealand's highways (excluding unsealed sections) totalling some 22,000 km. A database was constructed containing the survey data. This data was used together with data from Transit New Zealand's Road Asset Maintenance Management (RAMM) database and the Land Transport Safety Authority's Traffic Accident Report (TAR) database to develop a statistical model relating relative crash risk to road geometry. An attempt was made to investigate the effect of shape correction operations upon crash risk, although results were inconclusive due to the small number of crashes.

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

Published: | Category: Research & reports , Research programme | 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 192 Accident prediction models

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

Accident prediction models have been developed for rural and urban intersections and links. This includes models for traffic signals, roundabouts, priority and uncontrolled intersections, rural highways, motorways and urban arterial, collector and local streets. Accident (1995 to 1999) and flow data at over 1000 sites throughout New Zealand were used to develop the models. Test statistics have been prepared showing the goodness-of-fit and confidence intervals of the models. Application of the models in economic evaluation has been discussed along with the changes that would need to be made to the Project evaluation manual to incorporate the models.

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

Published: | Category: Research & reports , Research programme | 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 488 Crash risk relationships for improved road safety management

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

This report presents the results of a first attempt to combine detailed road geometry, road surface condition, carriageway characteristics and crash data information to develop a statistical crash prediction model for application to rural New Zealand state highways. Such a study was made possible because high-speed surveys generating simultaneously measured road condition and road geometry data for the entire 22,000lane-km of New Zealand's state highway network have been undertaken annually since 1997. Four road crash subsets were investigated: all reported injury and fatal crashes; selected injury and fatal crashes for loss-of-control events; reported injury and fatal crashes in wet conditions; and selected injury and fatal crashes in wet conditions. One- and two-way tables and Poisson regression modelling were employed to identify critical variables and their relationship with crash risk. Horizontal curvature, traffic flow, skid resistance and, to a lesser extent, lane roughness were critical variables common to all investigated crash subsets.

Research Report 386 Roundabout crash prediction models

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

The management of speed is considered an important safety issue at roundabouts. The approach speed and negotiating speed through roundabouts depends on the geometric design of the roundabout and sight distance. In New Zealand and in Australia, the design standards recommend long approach sight distances and provision of relatively high design speeds. This is in contrast to European roundabouts, where visibility is normally restricted and the geometric design encourages slow approach and negotiation speeds. This work, undertaken in 2006, extends previous research by the authors developing crash prediction models at roundabouts to include sight distance, intersection layout and observed speed variables.

Research Report 483 Crash prediction models for signalised intersections: signal phasing and geometry

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

In most cities and towns, the majority of crash black-spots occur at major intersections. Given this, crash reduction studies often focus on the major signalised intersections. However, there is limited information that links the phasing configuration, degree of saturation and overall cycle time to crashes. While a number of analysis tools are available for assessing the efficiency of intersections, there are very few tools that can assist engineers in assessing the safety effects of intersection upgrades and new intersections. Data from 238 signalised intersection sites in Auckland, Wellington, Christchurch, Hamilton, Dunedin and Melbourne were used to develop crash prediction models for key crash-causing movements at traffic signals. Separate models were built for peak periods and for motor vehicles and pedestrians. The key crash types that were analysed were right-angle, right-turning, lost-control and rear-end type crashes.

Research Report 139 Seasonal and weather normalisation of skid resistance measurements

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

This report presents the results of a research programme involving two phases. The first involved limited field measurements to quantify the relationship between wet pavement skid resistance, as measured by the GripTester and British Pendulum Tester, and temperature for a limited range of road surfaces. In the second phase, statistical methods, including analysis of variance (ANOVA), were applied to three long-term skid resistance databases to establish whether models could be developed to predict variations in skid resistance due to rainfall conditions, temperature effects and time of year. A significant finding was that existing temperature correction procedures for the British Pendulum Tester were inadequate. Furthermore, the skid resistance readings displayed temperature sensitivities that appeared to be a function of the road surface texture.