What is the main function of turn signals?

The main function of turn signals is to inform other drivers of your intentions. Using turn signals is a critical aspect of safe driving; they provide a visual indication to others on the road about your upcoming actions, whether it's a turn, lane change, or any maneuver that may affect surrounding vehicles. By signaling your intentions, you help ensure that all road users can react accordingly, thus reducing the likelihood of accidents and enhancing overall roadway safety.

While the other options may seem relevant to driving, they do not reflect the primary purpose of turn signals. For instance, saving fuel, signaling pedestrians, or increasing speed are not connected to the function of signaling one's driving intentions. Turn signals exist specifically to communicate with fellow drivers, making option B the correct interpretation of their function.