Which maneuver is illegal when approaching a roundabout?

Changing lanes while in the roundabout is illegal because roundabouts are designed for continuous flow and efficiency. When you are in a roundabout, each lane is designated for specific exit points, and changing lanes can cause confusion and increase the risk of collisions with vehicles that are already in their designated paths. Safety is paramount, and by maintaining your path within the lane you originally entered, you promote a smoother traffic flow and minimize potential hazards for yourself and others. In roundabouts, drivers are expected to be vigilant and remain in their lanes until they exit the roundabout, ensuring everyone adheres to the traffic rules to keep traffic moving safely.