United States Department of Transportation
i
Evaluation of the Crashworthiness of Thin-Walled Aluminum and Steel U-Channel Sign Supports
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1995-06-01
[PDF-25.88 MB]
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TRIS Online Accession Number:00746810
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Edition:Final Report
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Abstract:The New Hampshire Department of Transportation in cooperation with the Vermont Agency of Transportation initiated a crash-test program at the Texas Transportation Institute Proving Ground to evaluate the safety performance of small sign support installations currently being used in their states. The installations tested were (1) dual 76 mm (3.0 in.) diameter thin-walled aluminum supports, (2) single and dual 102 mm (4.0 in.) diameter thin-walled aluminum supports and (3) dual 3.7 kg/m (2.5 lb/ft) and 4.5 kg/m (3.0 lb/ft) steel u-channel small sign support installations. The crash tests were performed and evaluated in accordance with NCHRP Report 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features" for test level 3 (TL3) safety performance. The dual 76 mm (3.0 in.) diameter thin-walled aluminum supports, single 102 mm (4.0 in.) diameter thin-walled aluminum support, and dual 3.7 kg/m (2.5 lb/ft) and 4.5 kg/m (3.0 lb/ft) steel u-channel small sign support installations were all found to comply satisfactorily with the safety performance evaluation criteria presented for TL3 in NCHRP Report 350. The dual 102 mm (4.0 in.) diameter thin-walled aluminum support sign installation was found to comply with the safety performance evaluation criteria presented for TL3 in NCHRP Report 350 when the cross sections of the supports were modified by drilling holes as described in this report.
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