Draconian helmet laws, according to a post at the Daily Sightline. They write in favor of bike sharing programs that would "blanket urban areas with hundreds, even thousands, of identical, sturdy bikes and give people a huge network of convenient stations to park them at," but, they continue, "over-zealous helmet laws are blocking a transport revolution."
Forcing casual riders to don helmets is a high barrier to bike sharing. It depresses ridership, getting in the way of the overwhelming health and safety benefit of having more bikes on the roads. Providing headwear at kiosks or local businesses raises concerns about sanitation (lice!) and safety (cracked helmets). Casual, would-be riders weigh those concerns and decide to keep walking.
Besides, no bike-sharing program tells people not to wear helmets. They just leave wearing one as a personal choice.
More of the anti-helmet thinking over here.
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What's Getting in the Way of More People Riding Bicycles?
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