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could be on the books but not enforced. in my city helmets are required when riding those electric scooters. you're also exposed to the same DUI laws that apply to actual cars. doesn't stop a bunch of drunk college kids from riding them around with no helmet every night.

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There are more head traumas from car occupants than cyclists, it’s odd that there aren’t laws mandating helmets for drivers - 20% of Traumatic brain injuries Resulting in hospitalisation were caused by car crashes - about 1,000 a week.

I think the relevant statistic would be head trauma per miles traveled. But cars do get a lot of exceptions to standards society expects from other situations.

Given the wildly different rates of speed involved, incidents per unit of time would perhaps be more directly comparable.

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