Amazon and Google are working on developing their own air traffic control network for low-level altitudes so their drones can make deliveries. The system would use automated cellular and web apps to track and prevent collisions among the small unmanned aircrafts flying a few hundred feet above the ground. There would be a slow lane for local traffic below 200 feet, and a fast lane for long-distance transport between 200 and 400 feet. The companies planning on testing the drone system in several cities in the US within months but it will likely be at least two-years before the delivery drones are up and running.