Ihsdm

2006 Australasian Road Safety Research Policing & Education Conference, Gold Coast, QLD

Application of IHSDM Highway Safety Modelling to New Zealand
Glen Koorey University of CanterburyChristchurch, New Zealand

Presentation Outline
Rural Roads in NZ Background to IHSDM Package Adaptation of IHSDM to NZ
Calibration of Crash Prediction Model Development of Local Design Policy FileImporting Road Alignment Data

Local Site Testing

NZ Road Network...

NZ Road Network
90,000 km of Roads
~65% sealed

10,800 km of State Highways (Transit NZ)
170 km of motorway Remaining SHslargely two-lane rural roads

Relatively difficult terrain Major concerns with sub-standard curves and lack of passing opportunities

Evaluating Road Network Improvements
Key consideration isexpected crash risk
Existing & Proposed alignments

This information helps to
Prioritise existing sections for investigation Determine relative cost-effectiveness of different improvement optionsRelatively simplistic tools available in NZ
More suited to isolated features e.g. single curve

IHSDM has potential to help here

Background to IHSDM
Interactive Highway Safety Design ModelDeveloped by US Federal Highways Administration (FHWA) since ~1994 Set of software tools for assessing safety impacts of geometric design decisions Combines available knowledge about safety into aneasily accessible form
“Help planners and designers maximise safety benefits of highway projects within the constraints of cost, environmental, etc”

IHSDM Development
Initial development focused ontwo-lane rural highways
First public version, start of 2003 Version 3.0, Sept 2006

Work on multi-lane rural highways & urban arterials to come
First modules by 2007

IHSDM very applicable tothe bulk of NZ's rural state highway network

IHSDM Modules
Six modules (in single application)

(Driver/Vehicle Module still under development) All combined with associated support tools...