Funnily enough, the concept of a circular traffic junction - in a form similar to a roundabout today - was first introduced in Washington DC in the 1790s, including the Dupont Circle.
So literally speaking, you septics invented the roundabout traffic circle.
In about 1968, my dad drove round the roundabout in front of Buckingham Palace so us kids could get a better gander at the palace.
We got pulled over by a Bobby on the third circuit, and I kid you not, his first question was ‘What’s going on here, then?’ We were told if we wanted a better look, we would have to park the car and walk - like everyone else. The answer to the question is 3.
The bicycle was, in its present from, was invented by a Brit.