What is the general purpose of Control Zones around aerodromes?

The general purpose of Control Zones around aerodromes is to keep IFR (Instrument Flight Rules) aircraft within controlled airspace. Control Zones are established around airports to provide a safe and organized structure for both departing and arriving aircraft, especially those operating under IFR. This controlled environment enhances safety by facilitating more predictable and regulated traffic flows around busy airports.

In controlled airspace, air traffic controllers can provide instructions and guidance to pilots, helping manage the complex interactions of various aircraft types and their flight operations, particularly when visibility is poor or when weather conditions are challenging. This structured environment is essential for maintaining safety in the vicinity of airports, where a mix of IFR and VFR (Visual Flight Rules) operations can occur.

The other options do not align with the primary function of Control Zones. For example, increasing traffic congestion would be counterproductive to the purpose of airspace management. Monitoring VFR traffic is part of the broader responsibilities of air traffic control but does not represent the primary intent of the Control Zone itself. Providing unrestricted flight paths would contradict the very nature of controlled airspace, which is designed to regulate and provide clearance for aircraft operations.