What is the key visual cue that indicates a motorcycle is about to turn?

The motorcycle's turn signal lights serve as a critical visual cue indicating the rider's intention to turn. When a motorcycle is about to make a turn, the rider activates the turn signals, which are specifically designed to communicate the direction of the intended maneuver to other road users. This helps to alert surrounding drivers and pedestrians, promoting safety by reducing the likelihood of unexpected actions that could lead to accidents.

While headlights flashing can sometimes indicate an alert or intention from a rider, they are not standardized for signaling a turn. Engaging brake lights may indicate that the motorcycle is slowing down, but they do not specify the direction of a turn. Leaning to one side is a technique used by riders during turns to help maintain balance and control but does not serve as a clear signal to others on the road. Therefore, the use of turn signal lights is the most effective and recognized method for indicating a turning intention while riding a motorcycle.