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If car occupants must wear seat belts, why shouldn't cyclists wear helmets?
Cars and seat belts differ from bikes and bicycle helmets in three key ways:
- Seat belts provide far better protection to car occupants (72% fatality reduction in head-on crashes, for example ) than helmets provide for bicyclists (no proven reduction for fatal or disabling head injuries ).
- Helmet laws, and to a lesser extent helmet promotion, make cycling less safe by discouraging the activity and thereby undercutting safety in numbers. There are no such analogous effects for driving.
- By discouraging cycling, helmet laws suppress both the individual and societal health benefits of cycling, both of which are considerable . There is no such analogous effect for driving.
The combination of these three factors not only destroys the attempted analogy, it makes it more likely that bicycle helmet laws will cost lives rather than save them.
 Crandall CS, Olson LM, Sklar DP. Mortality Reduction with Air Bag and Seat Belt Use in Head-on Passenger Car Collisions. American Journal of Epidemiology, 2001;153(30:219-224.
 see: What evidence is there that cycle helmets save lives? and What evidence is there that cycle helmets reduce serious injury?
 see: The health benefits of cycling.