Instrument cluster failure and turn signal malfunction while highway driving. No interior sounds, including no lane change warning or near collision warning signals, and no audible confirmation of signal; no exterior blinker activated despite use by driver. Instrument cluster went blank. Safety at risk and accident occurred: approaching car from rear passenger side hit front right side of our car because there was no exterior signal and no audio or visual alerts in our vehicle about lane change or blind spot. Signal and instrument cluster failure: the car is at the manufacturer/dealer for the third time for similar issues with our vehicle (2 prior times they stated the issue was fixed). Manufacturer reports that they're sending a team to investigate given that this most recent episode lead to an accident.