What should riders signal well in advance for?

Signaling well in advance for turning is crucial for motorcycle riders as it communicates their intentions to other road users, allowing for safer navigation through intersections and turns. Timely signaling provides ample warning to vehicles and pedestrians, enabling them to anticipate the rider's movement and respond appropriately. This action is particularly important on a motorcycle, where visibility can be limited and maneuverability differs from larger vehicles. By indicating their turn ahead of time, riders enhance overall road safety, reduce the risk of collisions, and help maintain a smooth flow of traffic.

As for the other options, while riders should also signal for braking, acceleration, and lane changes, the context of the question specifically highlights the importance of signaling for turning as it directly pertains to navigating specific maneuvers that often involve greater interaction with other road users and potential hazards.