Conceptual development of an impact-attenuation system for intersecting roadways.

Details

• Creators:
  Putjenter, Joseph G. ; Bielenberg, Robert W. ; Faller, Ronald K. ; Reid, John D.
• Corporate Creators:
  Midwest Roadside Safety Facility
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Attenuation (Engineering) Bridge Railings Crash Cushions Guardrails Highway Safety Impact Tests Intersections Roadside Hazards
• Publication/ Report Number:
  TRP-03-312-15
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Corporate Publisher:
  Nebraska. Dept. of Roads
• Abstract:
  Longitudinal barriers are commonly used to shield hazards, including stiff bridge rail ends and slopes. In some locations,
  
  a secondary roadway intersects the primary roadway within the guardrail’s length-of-need (LON). Some intersections may
  
  have as little as 15 ft (4.6 m) between the intersection and beginning of the bridge railing, which require short-radius
  
  guardrail systems. One short-radius guardrail system has passed several crash tests under AASHTO Manual for Assessing
  
  Safety Hardware (MASH) standards.
  
  Site conditions provided by the Nebraska Department of Roads were used to determine the constraints for a new safety
  
  treatment for intersecting roadways and include intersection radii, bridge railing offset distances, and clear zone distances.
  
  An examination of the site conditions determined that the bridge railing end should be treated as a hazard, as defined in the
  
  AASHTO Roadside Design Guide. The hazard would begin at the bridge railing end with a width extending to the clear
  
  zone. Several design concepts were developed to treat these situations with a preference on using existing technologies that
  
  could be adapted for this hazard scenario.
  
  Fifteen concepts were brainstormed, with three considered for further analysis and evaluation. These concepts included
  
  net attenuation/end terminal, inertial barrel array/end terminal, and a bullnose with a secondary energy absorber inside of it.
  
  All three systems were capable of stopping a vehicle in the space available, but only the net attenuation/end terminal
  
  concept was considered likely to accommodate the site conditions using a moderate slope behind the system. Four dynamic
  
  bogie tests and two static tests were performed on potential net attenuators to evaluate their use as energy absorbers in the
  
  preferred design concept. Recommendations for further development of the net attenuation system were provided.
  
  
• Format:
  PDF
• Funding:
  SPR-P1(13)
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:abd7a28ca6169f801027cc8fb42ff31f99557971c01250c2477e604723a8a4e7d4cb4fb9587f529d08e1bbbbd5b9d2d433ed2230f39be4ce1201e38b8685266c
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29589/dot_29589_DS1.pdf
• File Type:
  [PDF - 41.57 MB ]