Deerfield did it right with respect to their helmet law. Excerpted below, Deerfield's village code requires persons under the age of 16 to use a helmet, it provides for standards the helmet must meet, and it allows that proof of compliance within 10 days after the violation may be used as a defense. More importantly, Deerfield built in language that prohibits a lack of helmet to be used against a cyclist in a civil suit. This means that drivers who negligently hit a cyclist who was not wearing a helmet will not be able to assert the lack of helmet as evidence of contributory negligence.
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