In September, IIHS posted protocol from rear underride crash testing onto their website. The semi-trailer underride protocol is located at the bottom of the page at this link: http://www.iihs.org/iihs/ratings/technical-information/technical-protocols
A pdf is available here: iihs-underride-test-protocol
Thank you, IIHS, for all of your important work to advance road safety!
