Elon Musk's plans for underground tunnels condemned

It was meant to be a futuristic vision of how we could avoid the frustration of getting stuck in traffic. Elon Musk recently shared his dreams of high speed travel in self-driven cars, using underground tunnels built under cities. But this is a case of running before you can walk, according to one expert. At the TED conference in Vancouver, Musk showed off a new video of electric'skates' transporting cars in a narrow tunnel under a city before raising them back to street level in a space as small as two parking spaces. Behind him a Tesla car can be seen on one of the'skates.