The cushion safe under-ride protector and cushion system was specifically developed to effectively shield highway construction and maintenance crews, trucks and passenger vehicles against serious injury and damage. The unit itself is situated on the lower, back end portion of the truck to prevent under-ride by an approaching vehicle. An impact attenuator is located on the heavy duty steel underside plate. It cushions the impact between the two vehicles by compressing and expelling water from cushion cells through holes in the cap, thereby dissipating the collision force. The under-ride protector and impact cushion system may be installed in minutes by a 2 or 3 man crew working as a team. Following assembly of the unit at the factory, cushion safe is attached after adjustment has been made for vehicle height. Triangulated, reinforced braces are than attached on either side of the truck from points on the lower rigid structure of the unit. The cushioning system, consisting of liquid filled vinyl tubular cells, each containing approximately 3 gallons of water-calcium chloride anti-freeze mixture, is factory mounted on the under-ride protector platform. After an impact, most often, the cushion only needs to be refilled. /HRIS/

  • Supplemental Notes:
    • Appeared in "Special Reports on: Use of Equipment and Methods of Maintenance". Research completed by Transpo-Safety, Inc.
  • Corporate Authors:

    Federal Highway Administration

    Construction and Maintenance Division, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Publication Date: 1975-7

Media Info

  • Features: Photos;
  • Pagination: 3 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00126296
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: Oct 18 1975 12:00AM