The driver may be unaware that the turn signals are not signaling their intentions to other drivers, which can increase the risk of a crash.

If one or both turn signal lights fail, the flashing rate may not change to warn the driver of the failure. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."

What to do: Book it in at your next service. There is no deadline and no charge.