[_delirium]

On the last point, that's something that comes up occasionally when helmet laws are discussed in Denmark: is there evidence that wearing a helmet on bike is more helpful than wearing a helmet as a pedestrian? If not, shouldn't a mandatory helmet law also mandate it for pedestrians?

There is also evidence that wearing a helmet in a car can reduce head injuries in some kinds of accidents, especially at highway speeds. Therefore one might wonder if a mandatory-helmet law should actually include all forms of transportation, including cars, bicycles, and walking. Or perhaps a subset, such as required for bicycles only when on major streets, and for cars only when on highways.