European Research Project: Vulnerable road users
Promotion of mobility and safety of vulnerable road users 
Final report of the European research project PROMISING (D-2001-3), section 5.4.7
SWOV Institute for Road Safety Research, The Netherlands, 2001
"From the point of view of restrictiveness, even the
official promotion of helmets may have negative consequences for bicycle use. If
the importance of wearing a helmet is stressed, the implied message is that
cycling is extraordinary dangerous. The report on cycling shows, however, that
refraining from bicycle use has far greater negative consequences for health
than increasing bicycle use without the wearing of helmets. To prevent helmets
having a negative effect on the use of bicycles, the best approach is to leave
the promotion to the manufacturers and shopkeepers".
Cited also by:
National Policies to Promote Cycling
European Council of Ministers of Transport
ISBN 92-821-2325-1, Paris, December 2004