2006 Koorey Rspeconf Ihsdm Ppt

7/31/2019 2006 Koorey Rspeconf Ihsdm Ppt

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App l icat i on o f I HSDMHigh w ay Safe t y Model l i ng

t o New Zealan d

2006 Australasian Road SafetyResearch Policing & EducationConference, Gold Coast, QLD

Glen KooreyUniversity of Canterbury

Christchurch, New Zealand


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Pr esen t at i on Ou t l in e

Rural Roads in NZ

Background to IHSDM Package

Adaptation of IHSDM to NZ

Calibration of Crash Prediction Model

Development of Local Design Policy File

Importing Road Alignment Data

Local Site Testing


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NZ Road Net w or k ...


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NZ Road

N e t w o r k

90,000 km of Roads

~65% sealed

10,800 km of State Highways (Transit NZ)

170 km of motorway Remaining SHs largely two-lane rural roads

Relatively difficult terrain

Major concerns with sub-standard curves andlack of passing opportunities


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Ev a lu a t in g Road

Net w or k I m p r ov em en t s

Key consideration is expected crash risk

Existing & Proposed alignments

This information helps to

Prioritise existing sections for investigation Determine relative cost-effectiveness of

different improvement options

Relatively simplistic tools available in NZ More suited to isolated features

e.g. single curve

IHSDM has potential to help here


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I HSDM Deve lopm en t

Initial development focused on

two-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 to the bulk ofNZ's rural state highway network


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I HSDM Modu les

Six modules (in single application)

(Driver/Vehicle Module still under development)

All combined with associated support tools


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Adap t at ion o f I HSDM

t o NZ

IHSDM designed for local customisation

Tasks to make IHSDM suitable for NZ use:

1. Calibrate crash prediction model with NZ data

2. Develop NZ Design Policy file based on localagency standards and guidelines

3. Develop importing routine for NZ highwaygeometry data

4. Modify models vehicle fleetin traffic simulation module

5. Validate speed prediction

routines for NZ conditions


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Cr ash Pr ed ict ion Modu le

(CPM)

Estimates number & severity of crashes on

roadway segments and intersections

CPM algorithm consists of

Base m ode l Provide estimate of safety performance for a

set of assumed nominal conditions

Cr ash m od i f i ca t i on f act o r s

Adjust base model to account for effects of:

Lane width, Shoulder width/type, Driveways,

Horizontal curves, Grades, Sight distance,

Passing lanes, Intersection control, Turn lanes


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Can use Empirical Bayes procedure

Combine safety predictions with crash history


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CPM Ou t p u t s


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CPM Cal i b r at io n

Calibration process available for adapting

CPM to any particular highway agency

Process allows for adjustment of 3 factors

Scaling factor for overall crash numbers Modify relative crash severity proportions

Modify relative crash type proportions

Spreadsheet templates for derivation ofsuitable calibration parameters

Ability to direct ly include historical crash

data also helps to calibrate the model


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CPM Cal i b r at io n


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Po l i cy Rev iew Modu le

(PRM)

Automates checks of compliance with

state/national highway design policies

Currently provided with US Federal(AASHTO) standards & guidelines

Specified in external files

Able to accept alternative criteria

e.g. state dept or local design policies

Local policy file developed for this work

Based on Austroads Rural Road Design


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PRM Ou t p u t s


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Pol icy Fi le Cal ib r a t ion


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I m p or t in g Road

Al ig n m en t Dat a

A number of different ways for road data

to be created or directly imported: Manually entered using Highway Editor tool

IHSDM "comma-separated values" (CSV) files

Industry-standard LandXML files

Most roading design software packages canproduce LandXML files from alignment data

e.g. Geopak, MX-Road, 12D

What about exist ing road geometry data?


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SH Geom et r y Da t a

( 1 0 m I n t er v als)


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Elem ent s Gener a t ed

f r om Road Geom Dat a


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Tr ia l

S i te

Wel l i ng ton

Auck land


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SH1 Aw at er e Br i dge


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Si te

Des ign

Existing/

ProposedAlignments

New route

alsoremovesrailwaycrossing


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Ex i st i ng Al ign m en t

Existing

Bridg

e


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Pr oposed Al ign m en t

Proposed

Brid

ge


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Ex i st i ng Al ign m en t

Existing

Bridge


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Pr oposed Al ign m en t

Propose

d

Bridge


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Fu t u r e W o r k

Local calibration tasks to complete

Awatere Bridge now under reconstruction

Validation of the crash prediction models forthe new alignment cant yet be undertaken

Further local testing of IHSDM planned

Highway sections realigned some years ago

Geometry data for both alignments

Sufficient before/after crash data available


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Conc lus ions

IHSDM is a promising tool for safety and

operational assessment of highwayalignments in New Zealand

Further work ongoing to carry out necessary

calibrations for general use here

Merit in a similar process being used toadapt IHSDM for other jurisdictions?

e.g. Australian states


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Fu r t h er I n f o r m at ion

Glen Koorey

University of Canterbury, Christchurch, NZ

[email protected]

http://www.civi l .canterbury.ac.nz

Download software from IHSDM website

h t t p : / / w w w . i h s d m . o r g /

FHWA Background references/research

http://www.tfhrc.gov/safety/ ihsdm/ihsdm.htm


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Th ank You !

Any Questions?

Join the University of Canterbury

Master of Engineering in Transportation(MET) Postgraduate Programme

Part-time study available for practitioners

Visitwww.met.canterbury.ac.nzfor more info

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