The February/March 2004 edition of "Hub and Spoke", the journal of the NRMA (National Roads and Motorists? Association) contains an analysis of crash rates on the Great Western Highway. This finds that the crash rate has increased despite massive spending on an "upgrade".
The article may be posted on http://www.mynrma.com.au/member_centre/community/research_reports/index.shtml.
One wonders why the NRMA continues to push for such works.