Controller reactions to free flight in a complex transition sector re-visited using ADS-B+ [ATC]

In 1998 ERAU ATM Research Laboratories and NARI carried out a simulation for NASA Ames. The experiment was designed to measure the performance of certified professional controllers in scenarios containing aircraft that were under their control and aircraft that were self-separating in a free flight operation. The experimental scenario used a busy transition sector with a mix of en-route and climbing and descending traffic. Controllers were responsible for ensuring the safety of all aircraft including the self-separating aircraft. The result of the first simulation was that as the number of self-separating aircraft increased so did the controller workload. This was considered to be due to the lack of intent information from the self-separating aircraft. This paper describes the result of revisiting the scenario but with the provision of automatic dependent surveillance roadcast information including the forecast trajectory change point information.