The impact of compulsory helmet legislation on cyclist head injuries in New South Wales, Australia: a response.

This article responds to criticisms made in a rejoinder (Accident Analysis and Prevention 2012, 45: 107-109) questioning the validity of a study on the impact of mandatory helmet legislation (MHL) for cyclists in New South Wales, Australia. We systematically address the criticisms through clarification of our methods, extension of the original analysis and discussion of new evidence on the population-level effects of MHL. Extensions of our analysis confirm the original conclusions that MHL had a beneficial effect on head injury rates over and above background trends and changes in cycling participation. The ongoing debate around MHL draws attention away from important ways in which both safety and participation can be improved through investment in well-connected cycling infrastructure, fostering consideration between road users, and adequate legal protection for vulnerable road users. These are the essential elements for providing a cycling environment that encourages participation, with all its health, economic and environmental benefits, while maximising safety.

[1]  Benjamin French,et al.  Analysis of longitudinal data to evaluate a policy change , 2008, Statistics in medicine.

[2]  J. Adams,et al.  Deep intracerebral (basal ganglia) haematomas in fatal non-missile head injury in man. , 1986, Journal of neurology, neurosurgery, and psychiatry.

[3]  Sylvia Titze,et al.  Taking up cycling after residential relocation: built environment factors. , 2012, American journal of preventive medicine.

[4]  Chris Rissel,et al.  The possible effect on frequency of cycling if mandatory bicycle helmet legislation was repealed in Sydney, Australia: a cross sectional survey. , 2011, Health promotion journal of Australia : official journal of Australian Association of Health Promotion Professionals.

[5]  Scott R Walter,et al.  Long term bicycle related head injury trends for New South Wales, Australia following mandatory helmet legislation. , 2013, Accident; analysis and prevention.

[6]  Jan Garrard,et al.  Cycling: getting Australia moving: barriers, facilitators and interventions to get more Australians physically active through cycling , 2008 .

[7]  L. Thibault,et al.  Biomechanics of acute subdural hematoma. , 1982, The Journal of trauma.

[8]  Raphael Grzebieta,et al.  The impact of compulsory cycle helmet legislation on cyclist head injuries in New South Wales, Australia. , 2011, Accident; analysis and prevention.

[9]  Andrew S McIntosh,et al.  Bicycle Helmets: Head Impact Dynamics in Helmeted and Unhelmeted Oblique Impact Tests , 2013, Traffic injury prevention.

[10]  J. Pucher,et al.  Cycling to work in 90 large American cities: new evidence on the role of bike paths and lanes , 2012 .

[11]  Raphael H. Grzebieta,et al.  Retraction of the Voukelatos and Rissel paper on bicycle helmet legislation and injury , 2011 .

[12]  J P Corner,et al.  MOTORCYCLE AND BICYCLE PROTECTIVE HELMETS: REQUIREMENTS RESULTING FROM A POST CRASH STUDY AND EXPERIMENTAL RESEARCH , 1987 .

[13]  Agathe Backer-Grøndahl,et al.  Bicycle helmets - A case of risk compensation? , 2012 .

[14]  Chris Rissel,et al.  Representations of cycling in metropolitan newspapers - changes over time and differences between Sydney and Melbourne, Australia , 2010, BMC public health.

[15]  Naomi Arndt,et al.  Estimating bicyclist into pedestrian collision speed , 2007 .

[16]  W J Curnow,et al.  Bicycle helmets: lack of efficacy against brain injury. , 2006, Accident; analysis and prevention.

[17]  W. Shadish,et al.  Experimental and Quasi-Experimental Designs for Generalized Causal Inference , 2001 .

[18]  D. Otte,et al.  Use of Throw Distances of Pedestrians and Bicyclists as Part of a Scientific Accident Reconstruction Method , 2004 .

[19]  R Cuerden,et al.  The potential for cycle helmets to prevent injury - A review of the evidence , 2011 .

[20]  J. Olivier,et al.  Scientific rigour in psycho‐oncology trials: why and how to avoid common statistical errors , 2013, Psycho-oncology.

[21]  W J Curnow,et al.  The efficacy of bicycle helmets against brain injury. , 2003, Accident; analysis and prevention.

[22]  M. Smith,et al.  Bicycle Commuting in Melbourne During the 2000s Energy Crisis: A Semiparametric Analysis of Intraday Volumes , 2011 .

[23]  W. Curnow,et al.  Bicycle helmets and public health in Australia. , 2008, Health promotion journal of Australia : official journal of Australian Association of Health Promotion Professionals.

[24]  Rune Elvik,et al.  Publication bias and time-trend bias in meta-analysis of bicycle helmet efficacy: a re-analysis of Attewell, Glase and McFadden, 2001. , 2011, Accident; analysis and prevention.

[25]  Tim Churches,et al.  Data and Graphing Errors in the Voukelatos and Rissel Paper , 2010 .

[26]  D. L. Robinson,et al.  Head injuries and bicycle helmet laws. , 1996, Accident; analysis and prevention.

[27]  Chris Rissel,et al.  The impact of compulsory cycle helmet legislation on cyclist head injuries in New South Wales, Australia: a rejoinder. , 2012, Accident; analysis and prevention.

[28]  Delia Hendrie,et al.  An economic evaluation of the mandatory bicycle helmet legislation in Western Australia , 1999 .

[29]  Catriona Bonfiglioli,et al.  Science, media and the public - the framing of the bicycle helmet legislation debate in Australia: a newspaper content analysis , 2011 .

[30]  W J Curnow,et al.  Bicycle helmets and brain injury. , 2007, Accident; analysis and prevention.

[31]  Jessica Edquist,et al.  Driver Compliance with, and Understanding of, Level Crossing Controls , 2010 .

[32]  M R Bambach,et al.  The effectiveness of helmets in bicycle collisions with motor vehicles: a case-control study. , 2013, Accident; analysis and prevention.