The help of the following people and organisations is greatly appreciated:

South Australia Police, for assistance with breath alcohol testing and the provision of information on crashes (particularly Sharon Fraser).

The South Australian Ambulance Service for notification of crashes.

Brian G. and Raymond R. McHenry, McHenry Software, Inc. for assistance with computer-aided crash reconstruction.

Lisa Wundersitz for the drafting of site diagrams.

Those people who worked on the collection of data for this study: Roland Earl, Roger Galbraith, Robert Baird and Matthew Baldock.

Chris Brooks and John Goldsworthy from the Federal Office of Road Safety for invaluable feedback and suggestions during the whole course of the study.

The study was funded by the Federal Office of Road Safety of the Australian Department of Transport and Regional Development and supported by the secondment of an engineer from the South Australian Department of Transport.

The NHMRC Road Accident Research Unit is supported by a Research Unit Grant from the National Health and Medical Research Council