What is the purpose of turn signals?

Turn signals are crucial safety signaling devices on vehicles. Their primary function is to clearly convey the vehicle's driving intentions, including turning, lane changing, overtaking, pulling over, or pulling away, to other road users through flashing lights. According to traffic regulations, when changing the direction of travel to the left or right, drivers must activate the turn signal in the corresponding direction at least 3 seconds in advance, so that vehicles in the rear and adjacent lanes have sufficient time to anticipate and adjust their speed or route, thereby effectively reducing the risk of rear-end or side collision accidents caused by sudden direction changes. For example, when overtaking on a highway, the left turn signal must be activated first to indicate the intention; after completing the overtaking, the right turn signal should be turned on to return to the original lane. When entering a roundabout, the left turn signal should be activated, and when exiting, the right turn signal must be used to alert vehicles inside the roundabout. In addition, turn signals can flash simultaneously in emergency situations (i.e., hazard light mode) as a signal for breakdowns or danger warnings. Correct use of turn signals is not only a legal requirement but also a core measure for drivers to coordinate with other road participants, ensuring overall traffic order and safety. Any behavior that neglects the operation of turn signals may significantly increase the risk of accidents.