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Displaying Page 115 of 116

Research Report 058 Seismic assessment of New Zealand highway bridges: development and testing of preliminary screening procedures

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

A preliminary screening procedure for the prioritisation of New Zealand State Highway bridges is presented. The procedure is designed to identify bridges which justify detailed assessment of their earthquake resistance. The derivation of the procedure is described and the source material is listed. The results of a pilot application carried out in 1994 of a preliminary version of the screening procedure are presented. The pilot application considered 29 bridges on State Highway 1 between Bulls and Wellington, North Island.  

The results from the screening procedure were compared with those from an economic analysis which used base data from an approximate structural assessment.  The comparison led to some modifications being made to the preliminary procedures to produce the final version. Results of the comparison and details of the modifications are presented. Keywords: Assessment, bridge, earthquake, highway, road, seismic, New Zealand

Road safety data – Dunedin city

Published: | Category: Otago Region , Research & reports , Road safety data | Audience: Local & regional government

A comprehensive compilation of road safety crash and casualty data in the Dunedin city area.

Research Report 011 Emulsified bituminous materials in road maintenance and construction: a survey of current New Zealand practice

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

Bitumen emulsions are now being used in almost every application in which hot, cut-back or fluxed bitumen binders are used. A survey of current practice in New Zealand for road maintenance and construction from 1987 to 1991 is recorded. Experience ranges from using bitumen emulsion for maintenance, tack coat, sealing, and slurry applications for State Highways, City streets and Council roads, and in Transit New Zealand regions. Binder performance of bitumen in general is discussed, with particluar reference to the effects of heat, oxidation, cutter and luxing stocks, and emulsification. Acceptance criteria for bitumen emulsions are specified in terms of stability, curing characteristics, and resistance to stripping. The summary provides volumes of bitumen used annually in New Zealand, applications used for bituminous emulsions, comparison of costs of hot bitumen with those of bitumen emulsions, as well as lists of benefits and limitations of bitumen emulsions.

Research report 436 Benefits of new and improved pedestrian facilities - before and after studies

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

Walking is an essential mode of transport. New and improved pedestrian facilities promote walking and provide greater access and mobility within our communities. The NZ Transport Agency has recently updated the procedures for the evaluation of pedestrian improvement projects. The benefit factor applying to new pedestrian trips was increased from $0. 50 to $2. 70/km, making pedestrian facility improvement projects more economically viable. Thus, estimating the increase in pedestrian flows (as opposed to simply recording existing pedestrian flows) is now important in the economic evaluation of new or improved facilities. This research analysed case studies at eight New Zealand sites where the implementation of new pedestrian facilities (or the improvement of existing facilities) led to increased pedestrian usage and improved perception of the sites. The study recorded pedestrian rates both before and after facility implementation, and analysed accompanying factors such as safety, delay and directness.

Research Report 307 Fatigue design criteria for low noise surfaces on New Zealand roads

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

Internationally low noise porous asphalts are typically laid on top of structural asphalt layers. In New Zealand structural asphalt is generally prohibitively expensive and porous asphalt is used directly on chipseal-surfaced unbound granular pavements. Two accelerated pavement tests were undertaken at the Canterbury Accelerated Pavement Testing Indoor Facility (CAPTIF) in 2004–2005. The first test was to develop a horizontal tensile strain versus fatigue life curve and establish a relationship between basecourse surface curvature and fatigue life. The second test evaluated the extension of fatigue life by short trafficking before surfacing rather than using enhanced binders in porous asphalt. The outcomes of the project suggest that the Austroads Rehabilitation Design Guide is very conservative in predicting fatigue and that deformation leads to surface failure before fatigue of the pavement occurs. Pavements to be sealed with low noise surfaces could tolerate more deflection if initial trafficking was undertaken.

Research Report 610 The assessment of the effects of small-scale development proposals on the transport network

Published: | Category: Integrated land use and transport systems , Research & reports | Audiences: Land developers, Local & regional government

The national integrated transport assessment guidelines used by practitioners in New Zealand only provide guidance for the assessment of significant sized developments, setting out the approach to be taken with varying assessment levels relative to size. It is becoming increasingly evident there are cases when small-scale developments, which do not trigger the lower thresholds for assessment, are having an effect either individually or cumulatively on the transportation network. In these instances, it may be necessary for the impacts of these small-scale developments to be assessed in an appropriate manner.  

This research investigated if and how the potential effects of small-scale developments should be identified and in doing so has provided an opportunity to fully understand if the absence of national guidelines is limiting the opportunity for effective network management and land use planning.

Roading data quality report – All RCAs

Published: | Category: RCA data quality , Research & reports | Audiences: Local & regional government, Road controlling authorities, Road traffic engineers & consultants, Roading contractors

These reports are the result of Road Efficiency Group’s (REG) assessment of the RCAs’ data quality. The 2016/17 ONRC data quality framework consists of 30 indicators and 35 metrics. The 2016/17 asset management data quality framework consists of 31 metrics. These metrics interrogate each RCA’s RAMM and Transport Investment Online (TIO) data for completeness, accuracy, timeliness, usability and consistency. 1

Each report shows, for each metric, how the RCA is positioned against what’s considered good (the expected standard) and where the sector sits. 1 Usability and consistency dimensions were added to the 2016/17 asset management reports.

Research Report 634 Effect of road seal type on resistance to traffic stresses

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

This report details research carried out from 2016 to 2017 as the preparatory stage of a larger programme to understand how chipseals may be improved to withstand increases in horizontal shear forces imposed by traffic loadings. The research aimed to develop an understanding of mechanisms and factors that lead to chip loss resulting from surface shear stresses, and to develop a methodology for testing seal performance under realistic but controlled laboratory conditions. The report commences with a literature review to collate and examine existing data and experience on seal selection and chip loss processes from New Zealand and overseas. Physical mechanisms, site and vehicle factors that contribute to seal damage are also investigated. Finally, an experimental test method and plan is developed to quantitatively compare and evaluate the effect of seal and binder type on overall seal performance in the laboratory, but under realistic loading and temperature conditions.

Roading data quality reports – South Taranaki District

Published: | Category: Taranaki Region , RCA data quality , Research & reports | Audiences: Local & regional government, Road controlling authorities, Road traffic engineers & consultants, Roading contractors

These reports are the result of Road Efficiency Group’s (REG) annual assessment of the South Taranaki District Council’s ONRC and asset management (AM) data quality. The 2017/18 ONRC data quality framework consists of 35 metrics and the asset management data quality framework consists of 31 metrics. These metrics interrogate the South Taranaki District Council’s RAMM and Transport Investment Online (TIO) data for completeness, accuracy and timeliness. Each report includes a summary of the metric results by dimension and category plus for each metric it shows how the South Taranaki District Council is positioned against what’s considered good (the expected standard) and where the sector sits. The metrics in the framework have been selected to test a cross section of the data underpinning the ONRC Performance Measure results and our decision-making processes. An individual metric result is intended to raise a red flag when not at the expected standard.

Research report 657 Human factor considerations for a licensing point system

Published: | Category: Health and safe people , Research programme , Research & reports | Audience: General

The NZ Transport Agency sought to better understand how licensing point systems (LPSs) operate, including how different population groups respond to LPSs

A literature review provided a theoretical background for understanding the functions of LPSs and factors that may influence LPS effectiveness. The LPSs that exist worldwide were studied to identify the features of a ‘best-practice’ system. The Transport Agency offence data for all New Zealand-licensed drivers from 2005 to 2014 was analysed to explore how individuals and cohort drivers respond to licensing points, and to identify factors that impact on the likelihood of multiple offending. An on-line survey of a representative sample of 999 New Zealand adult car-licence holders and focus groups with four key road-user groups (young novice drivers, Māori drivers, professional drivers and motor cyclists) were conducted to investigate knowledge of, and attitude toward, the LPS, as well as acceptability of possible refinements.