Under which airspace class does VFR traffic not require clearance to enter?

The correct answer is Class E airspace. In Class E airspace, Visual Flight Rules (VFR) traffic does not need to obtain clearance from Air Traffic Control (ATC) to enter. This designation allows for more flexibility and accessibility for pilots flying under VFR conditions, as they can navigate through this space without the necessity for prior authorization.

Class E airspace is generally used for a variety of operations, including those that might not operate in controlled environments, thus accommodating more pilots who may not be under IFR (Instrument Flight Rules). It typically exists in areas where there is less traffic and poses fewer risks of conflict compared to the more restrictive classes of airspace.

In contrast, Class A airspace requires all aircraft to operate under IFR and receive clearance from ATC, making it more controlled and structured. Class D airspace also necessitates communication with ATC, especially when entering or operating within the airspace around airports. Similarly, Class C airspace requires VFR aircraft to establish two-way communication with ATC before entering, further emphasizing the need for clearance in those environments.