Motorcyclists' helmets - Test methods and new technologies / DfT, 20 March 2007
PDF - http://www.thinkroadsafety.gov.uk/pdf/PPR186MotorcyclistsHelmets.pdf
"This document is the final report from the DfT research project ‘Motorcyclists’ Helmets - Test Methods And New Technologies’. The project carried an objective review of current and state of the art helmet technologies whilst developing a body of knowledge to develop the basis for a consumer information programme for motorcycle helmets."