An aftermarket device that attaches to the sides of a tractor-trailer successfully prevented a midsize car from sliding underneath the trailer in a 40 mph crash test, Insurance Institute for Highway Safety officials said. See crash test video.
August 30, 2017underride
Business, Equipment, Safety 
Insurance Institute for Highway Safety
Insurance Institute Conducts Successful Test of Side Underguard Protection
Insurance Institute for Highway Safety Technology, Equipment, Safety 
Airflow Deflector Inc.
Opinion: Trailer Side Underride Guards
Airflow Deflector Inc.In the case of semi-trailers, safety advocates, insurance companies and industry suppliers believe that if side underride guards are built, fleets will come and buy them.
July 24, 2017 Business 
The Insurance Institute for Highway Safety
Highway Safety Institute Backs Side Underride Guards for Trailers
The Insurance Institute for Highway Safety The Insurance Institute for Highway Safety said May 10 it supports creating a new safety mandate requiring side underride guards on semitrailers to help reduce a leading cause of truck-involved accident fatalities.
May 11, 2017 Business
Underride Guards Are Improved, But More Work Needed, Study Says
A new round of underride guard tests released last week by an insurance group showed trailer makers have made progress in protecting auto passengers during rear-end crashes, but the group said more needs to be done to enhance safety.
March 18, 2013