Which of the following is most likely to occur at the transition between Class G and controlled airspace?

At the transition between Class G airspace and controlled airspace, the most significant occurrence is a change in air traffic control requirements. Class G airspace is uncontrolled, meaning pilots are not required to communicate with air traffic control (ATC) and can operate with greater flexibility. However, as they enter controlled airspace, certain ATC communications and clearances become mandatory. This transition necessitates pilots to be aware of the requirement to establish radio contact with ATC, receive an appropriate clearance, and follow specific operational protocols in accordance with the regulations governing the higher classification of airspace.

This understanding is essential for pilots, as failing to comply with ATC regulations can lead to potential conflicts with other aircraft, safety hazards, and possible regulatory enforcement actions. The change in operational protocols and the need to adhere to ATC instructions is the key factor distinguishing controlled airspace from Class G airspace. Other options, such as increased airspeed restrictions or mandatory flight plan filing, are not inherently linked to the change in airspace classification itself and may apply under different scenarios or operational requirements rather than this specific transition. Similarly, while the traffic levels may change, a reduction in air traffic is not a guaranteed effect of entering controlled airspace, making the requirement for ATC