Design modifications are noted and the restuls are presented of testing of the CRBRS (collopsing-ring bridge rail system) that was developed to withstand impacts by large vehicles such as buses and trucks and also does not impact high accelerations to impacting smaller vehicles. The results of 4 test series (summarized and tabulated) revealed-that the modified or translating basepost design was effective in reducing heavy vehicle roll angles. The modified post provides forgiving stroke when less than the total 45.7-cm (18-in) stroke of the ring is available for energy absorption. The CRBRS can restrain articulated vehicles weighing up to 31 751 kg (70,000 lb) in 72.4-km/h (45 mph), 10-deg collisions and 18 144 kg (40,000 lb) in 88.5-km/h (55 mph), 14-deg impacts. Successful redirection of an 18 144-kg (40,000 lb) intercity bus in an 86.9-km/h (54 mph) impact at 15 deg was demonstrated.

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 27-31
  • Monograph Title: Photogrammetry, water quality, safety appurtenances, and shoulder design
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00148946
  • Record Type: Publication
  • ISBN: 030902563X
  • Files: TRIS, TRB
  • Created Date: Apr 13 1977 12:00AM