What should pilots ensure they have received before taxiing?

Pilots must ensure they have received taxi clearance before proceeding to taxi their aircraft on the runway or taxiway. Taxi clearance is a crucial communication from air traffic control that authorizes the pilot to move the aircraft on the ground while ensuring the safety of all aircraft in the vicinity. It includes specific instructions about the route to be taken and any hold points that may be necessary. Receiving this clearance helps prevent potential collisions with other vehicles or aircraft and ensures compliance with the airport's operational procedures.

While other options like fuel clearance, takeoff permission, and weather updates are important aspects of flight preparation and safety, they do not specifically pertain to the act of taxiing. Fuel clearance ensures that the aircraft has enough fuel for its journey, takeoff permission is necessary for airborne operations, and weather updates can affect flight planning and decision-making, but none are prerequisites for taxiing the aircraft itself. Thus, taxi clearance is the essential step that must be confirmed before a pilot commences taxi operations.