The maximum safe speed for a folder on British motorways would be 70mph and 30mph in residential areas. Same as cars really. Sammyboy is a threat when at full pelt in residential areas of Southampton or London. He would need a Dahon Speed Pro to be allowed on the motorways.

People have been seen breaking these speed limits after seeing Sammyboy riding naked behind them on his Downtube FS-FS (Full Suspension-Fully Starkers!) Unfortunately it did not trigger the speed cameras much to the anger of the local police in Hampshire.

I do know that an orange Downtube FS exceeded 70mph yesterday quite safely. It was in the back of Snafu21's not so green 4x4 returning after a Hyde Park Folding Society meeting