United States Department of Transportation
i
Analysis of existing work-zone devices with MASH safety performance criteria.
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2009-02-01
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[PDF-39.88 MB]
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NTL Classification:NTL-SAFETY AND SECURITY-Highway Safety;NTL-SAFETY AND SECURITY-Accidents;NTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic Control Devices;
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Abstract:Crashworthy, work-zone, portable sign support systems accepted under NCHRP Report No. 350 were analyzed to
predict their safety peformance according to the TL-3 MASH evaluation criteria. An analysis was conducted to determine
which hardware parameters of sign support systems would likely contribute to the safety performance with MASH.
The acuracy of the method was evaluated through full-scale crash testing. Four full-scale crash tests were
conducted with a pickup truck. Two tall-mounted, sign support systems with aluminum sign panels failed the MASH
criteria due to windshield penetration. One low-mounted system with a vinyl, roll-up sign panel failed the MASH criteria
due to windshield and floorboard penetration. Another low-mounted system with an aluminum sign panel successfully met
the MASH criteria. Four full-scale crash tests were conducted with a small passenger car. The low-mounted tripod system
with an aluminum sign panel failed the MASH criteria due to windshield penetration. One low-mounted system with
aluminum sign panel failed the MASH criteria due to excessive windshield deformation, and another similar system passed
the MASH criteria. The low-mounted system with a vinyl, roll-up sign panel successfully met the MASH criteria.
Hardware parameters of work-zone sign support systems that were determined to be important for failure with
MASH include sign panel material, the height to the top of the mast, the presence of flags, sign-locking mechanism, base
layout and system orientation. Flowcharts were provided to assist manufacturers when designing new sign support systems.
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