What is required to separate an arriving helicopter from others?

The requirement for an arriving helicopter to be separated from others is particularly crucial in managing the flow of air traffic and ensuring safety in the terminal environment. When the preceding arriving helicopter comes to a stop, it effectively creates a clear and definitive separation from any subsequent helicopter. This stop ensures that the airspace and the landing area are free from any potential conflicts, reducing the risk of accidents during the landing and taxiing phases.

Other measures like visual confirmation from the ground, communication with the tower, and monitoring for traffic, while important aspects of overall traffic management, do not provide the same level of immediate and clear separation necessary for helicopters. The dynamics of helicopter operations often mean they require specific instructions or separation protocols to maintain safety, particularly given their unique approach and landing characteristics. Therefore, having the first helicopter come to a stop is the most direct and efficient method to achieve that separation.