&quot;Since helmet laws don’t necessarily mean compliance, they looked at helmet usage, too, and once again found nothing.&quot;<p>Did the author <i>read</i> the study?  I can&#x27;t find anyplace where it has <i>any</i> data about usage.  In fact, the words &quot;comply(iance)&quot; or &quot;usage&quot; don&#x27;t appear in the document once, in any context.<p>Also, it doesn&#x27;t distinguish between those who always wear helmets and those who claim they use helmets at least half the time.