I had received the following information, that State of California is really looking into.
CHP: http://www.chp.ca.gov/html/truckstoppingdevice.html
Lab: http://www.llnl.gov/llnl/06news/NewsReleases/2001/NR-01-12-fact_sheet.html
This device is attached to the rear bumper of a tanker or icc bumper of trailer. The stoppage is by cutting off the airbrakes by hitting the back bumper where the device is. Causing the cab to drag the trailer to a stop.
CHP: http://www.chp.ca.gov/html/truckstoppingdevice.html
Lab: http://www.llnl.gov/llnl/06news/NewsReleases/2001/NR-01-12-fact_sheet.html
This device is attached to the rear bumper of a tanker or icc bumper of trailer. The stoppage is by cutting off the airbrakes by hitting the back bumper where the device is. Causing the cab to drag the trailer to a stop.