Urban commuters and casual bikers in Holland who wear helmets: approximately 0. I don&#x27;t know what would happen if they made helmets mandatory, but subjectively, needing to put on safety equipment to go to the supermarket three blocks away, or to the pub, is a significant difference in convenience and ease. Mostly because you need to keep the helmet somewhere. In Holland this would likely mean a table for six at the pub has five helmets on or near it. Might be a small problem in the grand scale but it would be annoying.