SENTRE and TREND attenuating systems
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SENTRE and TREND attenuating systems

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  • English

  • Details:

    • Alternative Title:
      Safety end treatment and transition end treatment attenuating systems
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    • Edition:
      Final report
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    • Abstract:
      The objective of this study was to construct SENTRE and TREND attenuator systems and evaluate their in-service performance as set forth in NCHRP-230 for a period of two years. The evaluation was conducted as part of ADOTs New Product Evaluation Program. Both of the systems had performed satisfactorily in full scale crash testing conducted during other research efforts, and were designated as experimental by the FHWA at the onset of the study. Four SENTRE end treatments were installed, one downstream and one upstream on both sides of a single bridge, as part of ADOT construction project HES-02202(33)P. Likewise, four TREND end treatments were installed, one downstream and one upstream on both sides of a single bridge, as part of ADOT construction project F-081-l(2). Both of these bridges extend over canals. The canals have parallel utility roads, and access to these roads precludes the full development of the length-of-need (LON) required with the use of guardrail. Following construction, the in-sewice performance was assessed from accident and maintenance cost records. The systems were constructed without major difficulty, the TREND was completed and operational November 3,1988, and the SENTRE was operational December 22,1988. During the evaluation period the SENTRE was hi twice and the TREND was hi once. None of the impacts lent themselves to a safety performance evaluation of the attenuators, however, each of these hits required repair and replacement parts for the attenuators. The repair process was found to be simple and in each case was performed without difficulty. However, the delivery time for replacement parts far exceeded EASl's claim of 48 hours. Delivery times ranged from two weeks to 37 days. The ATRC has recommended stockpiling spare attenuator parts in proximity to the attenuators for their timely repair. Further monitoring of the TREND is recommended until it is judged operational by the FHWA. /Abstract from report summary page/
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