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DADRL comment: According to GM DRLs have saved 423 lives over the past 10 years. Given that there are around 40,000-45,000 traffic fatalities in the United States each year [NHTSA], GM's new statement acknowledges that the effectiveness of DRLs in saving lives is about 0.1%. This is far lower than previous claims from GM and NHTSA. Furthermore, to make such a claim is to be completely ignorant of statistical significance. Assigning a 0.1% factor to a single safety device is simply not possible. GM also claims they "can reference more than 85,000 crashes of all types that never happened." Can the claims get anymore senseless? I can reference two crashes that didn't occur yesterday: my commute to and from work. It's pretty clear that GM is really grasping to try to keep DRLs alive. DRL effectiveness has not been proven and GM knows it!
UPDATE: April 19, 2007
Stephen Prower's critique of NHTSA's preliminary assessment. PDF file, 12kB.
Review of the evidence for motorcycle and motorcar daytime lights, Antonio Perlot, General Secretary, Federation of European Motorcyclists' Associations, and Stephen Prower, Research Officer, British Motorcyclists Federation. PDF file, 276kB. Also available as a Zipped Word Document.
Thirty Years on: Do motorcar daytime lights reduce
DOT Says Daytime Headlights Don't Help
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