In which area may a pilot request and receive a special VFR clearance?

A pilot may request and receive a special VFR clearance in control zones when visibility is less than the minimum required for VFR flight but greater than one mile. This allows pilots to operate visually under specific conditions while ensuring they can maintain separation from other aircraft and adhere to safety protocols.

Control zones are typically adjacent to airports, where air traffic is more congested, and this clearance helps ensure that pilots can operate safely during low visibility situations. This special clearance is particularly important in busy airspace, allowing pilots to navigate without relying solely on instruments when conditions allow for visual navigation.

Other types of airspace, such as restricted areas and military zones, generally have specific rules and restrictions that may not accommodate special VFR clearances due to operational security or safety concerns. Similarly, air traffic control sectors typically refer to larger blocks of airspace managed by controllers but do not inherently grant the ability to operate under special VFR conditions. Therefore, the answer is specific to the context of control zones, where this type of clearance is most appropriately applied.