Crash barriers behind sign trucks are movable energy absorption systems, in which part of the energy is dissipated by skid resistance of truck movement after impact. This feature reduces the stroke length of the "crushing force diagram" for the energy absorbing material, and a method to establish the ideal shape of such a diagram is presented in the report. Safety and technical requirements are listed and alternative solutions, using "Texas" type barrels, are described and discussed. Short attachments are easier to operate but less safe than longer barrel trailers. These two alternative prototypes were built and tested in various ways, also using various materials besides barrels: (1) component testing in the laboratory for crushing strength and metal fatigue; (2) Field testing of prototypes, central straight impact of cars; (3) Operational testing on Ontario highways. These tests and some accident performances are briefly described in the report. The "Texas" barrel system was found to be the most desirable material, with excellent control of crashing forces and also being the least sensitive with regard to height variations of impacting cars in relation to barrier heights, i.e. there was no "running under" or "climbing up" the barrier, but there was good catching of the car front within the height of the barrier and holding it. Through some accidents, good performance was demonstrated at angular hits and by a glancing hit with redirection of the car. Extensive operational testing was carried out, by driving around and using the two prototypes. This resulted in changes towards bolted barrel connections with hard rubber washers and spacers and using chains instead of suspension cables. Both systems can now be recommended for field use.

  • Corporate Authors:

    Ontario Ministry of Transportation & Communic, Can

    Policy Planning and Research Division
    Ottawa, ONo K1A 0N5,   Canada 
  • Authors:
    • Jung, F W
    • PRABUDY, D
  • Publication Date: 1981-6

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 33 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00341629
  • Record Type: Publication
  • Report/Paper Numbers: RE-80-01
  • Files: TRIS
  • Created Date: Dec 22 1981 12:00AM