Musk unveils underground tunnels, transport cars

The demo rides were considerably slower 40 mph (64 kph) than what Musk says the future system will run at 150 mph (241 kph). Still, it took only three minutes to go just over a mile from start to the end of the tunnel, the same amount of time it took to accomplish a right-hand turn out of the parking lot and onto a surface street before peak Los Angeles traffic.