What are the requirements for Special VFR flight in controlled airspace?

The requirements for Special VFR flight in controlled airspace emphasize the need for clear visibility and the pilot's ability to maintain visual reference to the ground. This is crucial because Special VFR allows a pilot to navigate and operate in controlled airspace during conditions that do not meet standard VFR weather minimums. Pilots must ensure they can see the ground and avoid obstacles while maintaining situational awareness throughout the flight.

The other points mentioned, while related to flight operations, do not encapsulate the core requirement for Special VFR. For instance, conducting flight only during daytime or the need to file a flight plan may sometimes be applicable, but they are not strict requirements for every Special VFR scenario. Additionally, while having an operable transponder is a good practice and may be required in certain controlled airspace, it is not exclusively mandated for all Special VFR operations. The emphasis remains on visibility and visual reference, which are fundamental to maintaining safety while operating in these conditions.