Final answer:
Air Traffic Control may grant SVFR clearance during daylight if the visibility is at least 1 statute mile. This allows pilots to fly in conditions below regular VFR minima while maintaining visual ground reference.
Step-by-step explanation:
Special Visual Flight Rules (SVFR)
Air Traffic Control (ATC) may authorize an airplane equipped with a two-way radio to depart from an aerodrome within a control zone during day Special VFR (SVFR) conditions provided that the visibility is at least 1 statute mile. While SVFR is mainly an aviation procedure that allows a pilot to operate in weather conditions that are below Visual Flight Rules (VFR) minima, it still requires a minimum level of visibility in which the pilot must be able to maintain visual reference to the ground. Moreover, the aircraft must be clear of clouds. The exact visibility requirements can vary by country, but generally, a visibility of at least 1 mile is considered the standard for SVFR flight during daylight within the control zone around an aerodrome.