What is an authorization by TC intended to prevent collision between known aircraft and for specified traffic control airspace?

Air Traffic Clearance is intended to ensure safe separation between aircraft within controlled airspace and to facilitate the orderly flow of air traffic. When a pilot receives an air traffic clearance, it represents an authorization from Air Traffic Control (ATC) that allows the aircraft to proceed according to specific instructions. This includes details such as the route of flight, altitude, and any additional instructions necessary for safety and efficiency.

This clearance is pivotal in preventing collisions by establishing parameters that all aircraft in the same airspace must adhere to, thus ensuring that known aircraft can maintain safe distances from one another. Rather than just simply notifying pilots, this clearance is a proactive measure that helps facilitate communication between pilots and ATC, allowing for coordinated movement.

In contrast, other options do not fulfill the same role as effectively. Flight Notification refers to informing ATC of a flight's intentions but does not in itself provide authorizations. Traffic Advisory gives alerts about potential conflicts but lacks the authoritative command found in an air traffic clearance. Flight Clearance Upgrades do not exist in standard terminology and thus do not pertain to the context of avoiding collisions in specified air traffic scenarios.