Red flag thing was the UK's Locomotives Act 1865, which dated from before what we call cars were invented. More aimed at traction engines (steam engines that go on the road). Exactly the type of regulation people like to mock the EU for.
replyLast year I went to a steam show and had to share the street with giant steam tractors for the first time. That law suddenly made sense. The visibility and stopping distance aren't great.
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