How do larger aircraft counteract the effect of induced roll caused by vortices?

Larger aircraft counteract the effect of induced roll caused by vortices primarily by extending their wingspan beyond the vortex. This is because vortices are generated at the wingtips of an aircraft during flight, creating areas of disturbed air. When flying through this disturbed air, particularly from other aircraft, a wider wingspan allows the larger aircraft to avoid the most intense part of the vortex, which is generally closer to the ground and located directly below the wingtip of the aircraft ahead.

By having a greater distance from the center of the vortex, the larger aircraft can maintain better control and stability, reducing the likelihood of experiencing significant induced roll from these atmospheric disturbances. This method effectively mitigates the impact of vortices and enhances safety and maneuverability.

The other choices do not address the specific aerodynamic principles involved in vortex interaction. Performing a barrel roll, for instance, introduces unnecessary risk and does not directly counteract the effect of vortices. Utilizing ailerons more effectively could be a valid technique for managing roll, but it does not specifically prevent the initial effects of vortices. Reducing airspeed would not effectively counteract the aerodynamic consequences of vortex interaction, as speed influences the severity of control response to such disturbances.