In which scenario is using radar separation preferred over non-radar procedures?

Using radar separation is preferred in scenarios where it is operationally advantageous because radar provides real-time situational awareness that enhances the ability to manage air traffic effectively. This advantage allows controllers to maintain safe distances between aircraft, provide quick updates, and adjust flight paths dynamically based on current conditions. Radar enables precise tracking of aircraft positions and movements, helping in maintaining separation, especially in complex airspace.

When operational advantages exist, such as increased traffic volume or fast-moving aircraft, radar separation is crucial for safety and efficiency. The quick response times facilitated by radar can significantly enhance the overall management of air traffic, reducing the risk of conflicts and improving flow through busy airspace.

The other scenarios, while relevant to air traffic management, do not inherently prioritize radar separation over non-radar procedures. Workload considerations, visual separation, and altitude are all important factors, but they do not capture the full operational benefits that radar provides in terms of situational awareness and traffic management.