One of the stated goals is to try and determine how statistically significant TBI is in motorcycle and bicycle accidents.
Null hypothesis here will be that motorcycle accidents will have a much higher prevalence of TBI than in bicycle accidents, down to the typical routes and speeds alone.
Nick Rushworth, executive officer of Brain Injury Australia has been most helpful in pointing me to some statistics on New South Wales road crashes as well as some more general statistics from 2004-05 on TBI cases in general . His assistance in this has been a big help.
The Queensland Department of Main Roads also produces a number of reports, as well as a request form. Transport for NSW also provide statistics. I think the data is there, we’ve just got to figure out a means to drill into it.