From space age electric tuk tuks to poo-powered tuk tuks, the idea of a cleaner ride is nothing new. Pictured above is yet another alt-energy tuk tuk, this one from a few years ago in Bangkok.

Ocado has shown off a prototype driverless van designed to deliver goods at short distances. The vehicle, a cross between a small milk float and a large tuk-tuk, spent two weeks completing ...