The original Traffic Safety Act of 1930 in the United Kingdom mandated that all vehicles carry a bell or horn, but the law was so poorly enforced that a significant portion of early motor vehicles simply didn’t comply—leading insurance companies to offer modest discounts for cars that actually had audible warning devices, essentially creating a market-based enforcement system that worked better than government regulation because drivers could tangibly profit from compliance.
Car Fact #131 — October 25, 2026
