Which airspace control method allows for clear procedural guidelines without direct intervention?

The choice of procedural control as the correct answer highlights its significance in airspace management. Procedural control permits the establishment of structured guidelines that facilitate the safe and efficient use of airspace without necessitating real-time intervention by air traffic controllers or other directing authorities.

This method relies on predetermined rules and procedures, allowing aircraft to operate independently while adhering to specific protocols, such as reporting points or altitude assignments. The simplicity and clarity of these guidelines empower pilots and operators to coordinate their actions based on established frameworks, reducing the complexity that may arise from direct management, which can be resource-intensive.

In contrast, positive control involves active oversight and communication from air traffic control or a commanding authority. This method may not offer the same level of autonomy that procedural control does. Active and passive controls also pertain to different degrees of management involving direct intervention or reliance on surveillance, which detracts from the procedural control approach's core strength: delineating clear procedures that guide airspace usage without the need for direct intervention. Thus, procedural control stands out as the most apt choice for the question posed.