What characterizes congested airspace?

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Congested airspace is primarily characterized by tiered airspace around large towered airports. This type of airspace is designed to manage a high volume of air traffic safely and efficiently. The tiered structure allows for various altitude levels that help separate arriving and departing aircraft, thereby minimizing the risk of collision and ensuring more organized operations as aircraft interact in the busy airspace.

Around large towered airports, the volume of takeoffs, landings, and transiting traffic demands structured airspace to maintain safety. The airspace is typically divided into classes, often including controlled and restricted zones, enabling air traffic control to regulate movements effectively. While tiered airspace can exist around smaller airports, the level of congestion and the need for stricter control measures are more pronounced at larger airports where air traffic is higher.

The other options do not accurately depict congested airspace conditions. Uncontrolled airspace, for example, lacks the level of oversight necessary to be considered congested. Similarly, all airspace below 10,000' MSL is not exclusively congested; rather, it varies widely depending on the location and time. Therefore, the correct answer highlights the specific complexity and structure of airspace around large towered airports, which is essential for managing

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