Testing and evaluation of sign support with cluster attachments.
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Testing and evaluation of sign support with cluster attachments.

Filetype[PDF-1.28 MB]


  • English
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    Details:

    • Creators:
    • Corporate Creators:
      Texas Transportation Institute
    • Corporate Contributors:
      Louisiana Transportation Research Center
    • Subject/TRT Terms:
    • Publication/ Report Number:
      FHWA/LA-90/230
    • Resource Type:
      Tech Report
    • Geographical Coverage:
      Louisiana
    • Corporate Publisher:
      Texas Transportation Institute
    • Abstract:
      Two full-scale crash tests were conducted on the Louisiana two-post, inclined, slip-base sign assembly with cluster sign attachment. These two tests were performed and evaluated in accordance with guidelines under NCHRP Report 230 and standards established in the 1985 AASHTO "Standard Specifications for Structural Supports for Highway Signs, Luminaries, and Traffic Signals." The sign supports broke away readily in both the low-speed and the high-speed tests through activation of the slip-base breakaway mechanism. The sign panel did slap the rear of the roof of the vehicle and the support posts contacted the rear of the vehicle in the low-speed test, but the impact was very minor with little resulting damage to the vehicle, and there was no penetration of the test object into the passenger compartment. The vehicle sustained minor to moderate damage in the two tests and was stable throughout the collision without exhibiting any tendency of rollover or instability. Neither the vehicle nor the sign installation presented any undue hazard to other traffic after the impact in either test. The occupant impact velocities and ridedown accelerations for both tests were well below the limits recommended in NCHRP Report 230. The Louisiana two-post, inclined, slip-base sign assembly with cluster sign attachment as tested in this study conformed to the evaluation criteria recommended in NCHRP Report 230 and the AASHTO standards. There is no indication that the attachment of sign clusters to the support posts poses any potential adverse effect on the impact performance of the slip-base breakaway design.
    • Format:
      PDF
    • Funding:
      736-14-59 (LTRC #89-455 (B))
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