The main reason why turn signals are not designed on the steering wheel involves considerations of safety and operational logic. The steering wheel needs to be turned frequently while driving; if the turn signal switch were integrated here, it might cause the driver to accidentally activate it or have difficulty operating it precisely during turns, thereby increasing safety risks. From a technical perspective, turn signals achieve flashing through a flasher relay, with their circuits connected to either the Body Control Module (BCM) or an independent relay. This requires stable electrical connections rather than wiring that rotates with the steering wheel, preventing wire entanglement or signal interference. Some high-end models are equipped with automatic turn signal functionality, which activates by monitoring steering wheel angle through sensors, further minimizing the need for manual operation. This design achieves an optimal balance between safety, reliability, and operational convenience, representing a mature solution thoroughly validated by the automotive industry.
