Turn signals are among the most critical safety features on any vehicle, providing a clear, visual cue to other drivers and pedestrians about your intended direction. When you notice your turn signal indicator blinking fast, it's more than just a minor inconvenience—it's your car's way of telling you that something's wrong in the lighting circuit. This comprehensive guide will explain why your turn signal indicator might be blinking rapidly, how to diagnose and fix the problem, and how to prevent it from happening in the future.