Pocket-sized personal transporters could soon be seen on the streets of Tokyo. A Japanese engineer has developed a portable transporter small enough to be carried in a backpack that he says is the world’s first ‘car in a bag’. Twenty-six-year-old Kuniako Sato and his team at Cocoa Motors recently unveiled the lithium battery-powered “WalkCar” transporter, which is the size of a laptop and resembles a skateboard more than a car. The slender WalkCar is made…