Here are the most recent comments posted on the Federal Register for the rear underride rulemaking for trailers (including the Virginia Tech engineering student design team):

DOCUMENT ID:    NHTSA-2015-0118-0013 (http://www.regulations.gov/#!documentDetail;D=NHTSA-2015-0118-0013)
DOCUMENT TYPE:  SUPPORTING & RELATED MATERIALS
POSTED DATE:    02/09/2016
DOCUMENT TITLE: Response to NPRM:  Rear Impact Guards, Rear Impact Protection

DOCUMENT ID:    NHTSA-2015-0118-0014 (http://www.regulations.gov/#!documentDetail;D=NHTSA-2015-0118-0014)
DOCUMENT TYPE:  PUBLIC SUBMISSIONS
POSTED DATE:    02/09/2016
DOCUMENT TITLE: Comment of The National Transportation Safety Board

DOCUMENT ID:    NHTSA-2015-0118-0015 (http://www.regulations.gov/#!documentDetail;D=NHTSA-2015-0118-0015)
DOCUMENT TYPE:  PUBLIC SUBMISSIONS
POSTED DATE:    02/09/2016
DOCUMENT TITLE: Comment from American Trucking Association

This is the comment from the Virginia Tech Senior Underride Design Team:

DOCUMENT ID:    NHTSA-2015-0118-0016 (http://www.regulations.gov/#!documentDetail;D=NHTSA-2015-0118-0016)
DOCUMENT TYPE:  PUBLIC SUBMISSIONS
POSTED DATE:    02/09/2016
DOCUMENT TITLE: Comment from Mechanical Engineering Underride Design Group

DOCUMENT ID:    NHTSA-2015-0118-0017 (http://www.regulations.gov/#!documentDetail;D=NHTSA-2015-0118-0017)
DOCUMENT TYPE:  PUBLIC SUBMISSIONS
POSTED DATE:    02/09/2016
DOCUMENT TITLE: Comment from The Association for the Work Truck Industry

All comments can be seen here:  http://www.regulations.gov/#!docketDetail;dct=FR+PR+N+O+SR;rpp=10;po=0;D=NHTSA-2015-0118

The formal Public Comment period will end on February 16, 2016.