On the recommendation of the Federal Highway Administration the New Jersey Department of Transportation selected the "Breakaway Cable Terminal" (BCT) for use as a guiderail end treatment in 1976. The selected design included 6" x 8" wood posts, an unstiffened buffer end, a bossed bearing plate and a one-piece anchor plate. The objective of this study was an evaluation of the in-service performance of BCTs. Thirteen impacts between vehicles and BCTs were evaluated for accident performance. The results of the in-sevice evaluation were compared with the full scale crash tests previously conducted by the Southwest Research Institute. The New Jersey in-service experience was similar to the initial tests by SwRI and the BCT is warranted for flared guiderail installations. Small car spearing occurred with end-on impacts (no flare) on straight guiderail sections. A recommendation was made to reinforce the unstiffened buffer end on straight guiderail sections. In several instances the spliced rail sections did not facilitate rail separation from the posts probably causing the stiffened rail to penetrate (spear) the vehicle. A recommendation was made to replace the two twelve and a half foot sections with one twenty-five foot section essentially eliminating the splice. Vehicle rebounding occurred and was apparently due to the operators' reactions at the time of impact. In some instances curbs and shoulder berms appeared to cause ramping of the vehicle on impact. Recommendations were made to closely follow the SwRI provisions for the BCT installation. (FHWA)

Media Info

  • Pagination: 43 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00323185
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-NJ-81-001 Final Rpt., FCP 41G1-134
  • Contract Numbers: NJ 7999 Item 3
  • Created Date: Mar 12 1981 12:00AM