Car was involved in a head on collision [XXX] with a concrete exit barrier after being pushed into the lane by a driver trying to in front of them trying to make a last second dash for the exit. Not sure if the driver was in blind spot, but the vehicle trying to merge did use turn signal or respond to horn honking from myself. In order to avoid the hitting the other driver, who was unaware of my car while aggressively merging, I tried driving into the safety lane, but at 65 MPH could not stop in time from hitting the barrier My safety was put at risk because upon impact the driver airbag did not deploy. The entire front end of the car crumbled and the car was declared totaled by the driver's insurance. The airbag deployment could have prevented more serious injury to the driver, by did not deploy. The driver was wearing their seat belt and suffered a bruised sternum and PTSD. Driver called police who did not file a report due to no damage to another vehicle or property or several injury to any persons. Airbag was part of the takata airbag recall for Subaru. Airbags are on record of being replaced at a Subaru dealership Redwood City, California- driver verified post crash. There were no warning lamps indicated the airbag was disabled. Driver alerted Subaru's quality control hotline who inspected the car on [XXX]. No word has been returned on why the airbag did not deploy during the crash. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 5