Final answer:
Both right and left turn signals flashing simultaneously on a vehicle typically indicate a hazard or emergency, alerting other drivers to proceed with caution.
Step-by-step explanation:
When a moving passenger vehicle has both right and left turn signals flashing at the same time, it typically indicates a hazard. This is a universal signal that the driver is warning other road users of a potential danger or that the vehicle itself may be experiencing an emergency or breakdown, making it a hazard. This action urges other drivers on the road to proceed with caution.
Although flashing both turn signals is not a standard practice for turning or changing lanes, it is widely understood to mean that the vehicle is a road hazard, and other drivers should be alert and give space if possible.