On my way to work this morning I saw an interesting self-build. It was an ordinary pushbike with a small petrol engine strapped to the frame, like the engine from one of those mini motorbikes. It came along side me briefly but I wasn't able to see how it was connected. It then flew off round the corner and up a hill at way more than 15mph.
This was in a town centre.
This was in a town centre.