That's the "Hurt Report". It helped shape training curriculum after publication.
http://en.wikipedia.org/wiki/Hurt_Report


Due in large part to the extreme increase in frequency of US motorcycle fatalities since the Hurt Report was published, a new study, begun in 2009, is underway at Oklahoma State University.
http://www.fhwa.dot.gov/research/tfhrc/projects/safety/motorcycles/MCCS/links.cfm

Apparently it may take a matter of years to conclude and publish. They want to dig in pretty deeply to go beyond who is at fault to include causation if possible. One source figured a cost of $7500 per accident to complete the study.
http://www.nhtsa.gov/staticfiles/nti/pdf/811280.pdf