Take note of a recent public comment on NHTSA’s truck underride rulemaking:
Comment_from_Seven_Hills_Engineering,_LLC
Perry Ponder from Seven Hills Engineering makes some timely observations. Anyone concerned about preventing deadly underride crashes will want to make sure that regulators and manufacturers are listening.
Here is the 1969 DOT document to which Perry refers–in which they indicate their intent to extend underride protection to the sides of large vehicles: 
Looking forward to a lively Underride Roundtable on May 5, 2016.
What kind of underride protection would be the result of a Vision Zero Rulemaking Policy?
Thanks for the additional evidence that we the people continue to suffer from Government for the corporations by the corporate lobbyists.