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Re:G.M. Unveils Its Driverless Cars, Aiming to Lead the Pack by michaelbuckbee on Wednesday November 29, 2017 @02:46PM (#15810193)
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-befo...

Re:G.M. Unveils Its Driverless Cars, Aiming to Lead the Pack by thealfreds on Wednesday November 29, 2017 @05:12PM (#15811378)
Nice QI clip about this too. https://www.youtube.com/watch?v=--8bqcCJ0L4