I found out which crash the new Stoughton rear underride guard was in. Here is a photo of a recent crash on the New York State Thruway.
Photo from Syracuse.com crash story: At least 3 people injured in pileup on NYS Thruway in Warners
Imagine. The new guard did what it was supposed to do! There was no Passenger Compartment Intrusion. The driver in this car survived.
Thank you, Lord. Thank you, Stoughton. Thank you, Trucking Industry for responding to the research and our pleas. Thank you, everyone who has supported this effort.
Here are the crash tests done by IIHS on the 5 major trailer manufacturers who have voluntarily improved their rear underride guard: