Which factor can assist a cyclist when changing lanes in traffic?

Using hand signals is crucial for cyclists when changing lanes in traffic as it communicates their intentions to other road users. This visual cue enhances safety by alerting drivers and pedestrians about the cyclist's planned movement, reducing the likelihood of collisions. Hand signals serve as a form of non-verbal communication that informs others in proximity, creating an environment of awareness and consideration on the road.

While maintaining a constant speed can contribute to predictability, it does not actively inform others of the cyclist's intentions. Deploying a reflective vest increases visibility but does not convey lane change plans. Shouting for attention may distract or confuse other roadway users, which could lead to dangerous situations rather than enhancing safety. Therefore, hand signals are the most effective and appropriate method for signaling lane changes.