In-Service Performance Evaluation of Iowa’s Sloped End Treatments
Sloped end treatments (SETs) were historically developed as low-cost, low-maintenance end treatments for rigid features like concrete barriers and bridge rails. Crash testing indicated that sloped end treatments are associated with significant instability for impacting vehicles, but their historical crash performance was not known. An in-service performance evaluation (ISPE) was performed to evaluate vehicle crashes with sloped end treatments in Iowa between 2008 and 2017. Researchers generated a geographic inventory of 658 sloped end treatment locations, reviewed crash narratives and scene diagrams for crashes near these sloped end treatments, and calculated an estimated crash rate and crash cost for these sloped end treatments. A total of 30 SET-related crashes were identified, resulting in one fatal crash and one severe injury crash. Eighteen of these crashes climbed the SET feature and seven crashes were associated with vehicle rollover, with eight unknown crash outcomes. The estimated sloped end treatment average crash cost was approximately $178,260. For comparison, crash costs for other fixed objects in the same vicinity as sloped end treatments, typically associated with roads with higher speed limits, averaged $67,449 per crash. Benefit cost was calculated for replacing select groups of sloped end treatments with various crash cushions. Nineteen of the crashes occurred on a total of seven bridges, indicating most impacts were in “black spot” locations. Researchers recommended prioritization of removal and replacement of some sloped end treatments based on crash history.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/9783030798000
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Supplemental Notes:
- © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2022.
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Authors:
- Stolle, Cody
- Lingenfelter, Jessica
- Clute, Khyle
- Bielenberg, Robert
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Conference:
- 18th International Road Federation World Meeting & Exhibition
- Location: Dubai , United Arab Emirates
- Date: 2021-11-7 to 2021-11-10
- Publication Date: 2022-4
Language
- English
Media Info
- Media Type: Web
- Edition: 1
- Features: References;
- Pagination: pp 789-804
- Monograph Title: Advances in Road Infrastructure and Mobility: Proceedings of the 18th International Road Federation World Meeting & Exhibition, Dubai 2021
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Serial:
- Sustainable Civil Infrastructures
- Publisher: Springer Cham
- ISSN: 2366-3405
- Serial URL: https://www.springer.com/series/15140
Subject/Index Terms
- TRT Terms: Barriers (Roads); Costs; Crash characteristics; Crash cushions; Equipment design; Performance
- Geographic Terms: Iowa
- Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation;
Filing Info
- Accession Number: 01870657
- Record Type: Publication
- ISBN: 9783030798000
- Files: TRIS
- Created Date: Jan 24 2023 9:28AM