United States Department of Transportation
i
Crash testing of Louisiana's multi-directional, single steel post, small sign support.
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1992-06-01
[PDF-3.34 MB]
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Abstract:The Louisiana Department of Transportation and Development (LDOTD) contracted with the Texas Transportation Institute (TTI) to evaluate the impact characteristics of Louisiana's multi-directional 5 inch diameter steel post, small sign support when impacted by an 1,800 lb vehicle at 20 and 60 mi/h. However, only the low-speed crash test was conducted. The crash test was conducted and evaluated in accordance with criteria provided in the 1985 American association of State Highway and Transportation Officials (AASHTO) Guide: Standards Specifications for Structural Supports for Highway Signs, Luminaries, and Traffic Signals and the National Cooperative Highway Research Program (NCHRP) Report 230.
The 60 mi/h crash test was not conducted due to the severity of damage sustained to the test vehicle and the results of the data collected in the low-speed test. The low-speed test failed to meet the test criteria by: (1) the sign installation violated the occupant compartment integrity and (2) excessive occupant impact velocity in the longitudinal direction. This sign installation in "strong oil" is unacceptable according to the evaluation criteria recommended in NCHRP Report 230 and the 1985 AASHTO Standards.
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