The design of air freeway ramp and collision risk analysis

The rapid growth of air traffic led to the airspace resources increasingly tense. The air freeway is one of the methods to solve air traffic congestion. Similar to the ground freeway, on-ramp and off-ramp are the key parts. They can lay a huge impact on the main way and there is some risk of collision in the on-ramp. The paper describes the basic structure of the air freeway and, on the application of Performance Based Navigation, the structure of the air freeway on-ramp is given. By using the cross route events-based collision risk model, collision risk of the on-ramp is also analyzed. Its collision risk can reach the ICAO safety target level of lateral separation as long as the aircrafts turn into the air freeway before the latest turning point.