Britain did at one time have "red flag laws" that mandated that a person precede the car waving a flag to alert people (and horses). https://www.autoevolution.

Britain did at one time have "red flag laws" that mandated that a person precede the car waving a flag to alert people (and horses). https://www.autoevolution.com/news/road-traffic-history-before-the-streets-got-swamped-12954.html https://www.autoevolution.com/news/road-traffic-history-befo...