Resources

An evaluation of models which predict noise levels from road traffic in terms of the LEQ (24-hour) index was undertaken in 1998 by comparing predicted levels with noise levels measured at 20 sites.

This research reviewed the literature on traffic growth prediction in New Zealand and overseas, surveyed local traffic growth forecasting practice in New Zealand, reviewed the traffic growth procedures in the Project Evaluation Manual, and attempted …

Small diameter tyres are increasingly being used in heavy vehicle applications.

A high binder content (78%) polymer-modified bitumen emulsion used in a 'racked-in' sealing system was trialed from 1993 to 1995 as a surfacing in high traffic stress areas for New Zealand roads.

The guidelines for sensitivity analysis in project evaluation, as used in the Transit New Zealand Project Evaluation Manual (PEM), have been improved.

The application of the Austroads Pavement design guide to Taranaki 'brown ash' has been investigated.

A test procedure to measure the long-term durability of bitumens useed in chipseals on New Zealand roads is described.

Subsoil drainange of the road pavement and subgrade is important to the performance and life expectancy of road pavements.

Refining practice for bitumens in New Zealand has been reviewed over the years, and a range of bitumens of different temperature sensitivities may become available for roadmaking in New Zealand.

This report describes the work undertaken between 1992 and 1995 under the first and second stages of a research project into road vehicle repair and maintenance costs in relation to road operating conditions.