https://en.wikipedia.org/wiki/Reliant_Robin

The three wheels and the fibreglass construction meant that it was light enough to count as a tricycle, so that you could drive one on a motorcycle license rather than a full driving license. Plus they sip quite gently at the petrol by the standards of the 1970s. You still saw a few on the roads when I was growing up in the 80s, but it's been a long time.

The thought of doing 85 mph in one of them is enough to make me fill my trousers, though. Couldn't pay me enough.