@cnn: The VX4 is a new mode of urban transport. Its simple mechanics, zero emissions, airliner safety standards, and low noise, may well allow it to fly where helicopters and VTOLs have struggled to: city airspace. CNN’s Max Foster takes a trip to the manufacturer's hangar in Bristol to investigate their belief that the VX4 will be in the skies of cities across the world by 2030, all while not costing much more than a regular taxi ride.