In-Service Performance Evaluation of Guardrail End Treatments (2018) / Chapter Skim
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Pages 94-103
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From page 94... ...
4 Routine In-Service Evaluation of Roadside Devices Chapter 1 cited the recommendations in the Manual for Assessing Safety Hardware (MASH) that highway agencies conduct in-service evaluations of roadside safety devices as a routine activity.
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From page 95... ...
ROUTINE IN-SERVICE EVALUATION OF ROADSIDE DEVICES 95 • Providing notice that a device type is not performing as expected. Evaluation would give the highway agency assurance that any device type that was susceptible to failure in circumstances overlooked in design and testing would be identified, even if failures were rare.
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From page 96... ...
96 PERFORMANCE EVALUATION OF GUARDRAIL END TREATMENTS • Difficulties involving coordination and communication: - Lack of a cooperative relationship with police agencies for timely receipt of a crash report, - Restrictions on the release of data involved in police investigation, and - Lack of established procedures and intraagency relationships needed for collation of maintenance records for use in evaluations. • Resource limitations: - Lack of crash investigation capability within the highway agency and - Lack of funding and staff for data collection and analysis.
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From page 97... ...
ROUTINE IN-SERVICE EVALUATION OF ROADSIDE DEVICES 97 • Evaluation methodologies. Measures of performance and data analysis methods for computing the measures must be specified.
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From page 98... ...
98 PERFORMANCE EVALUATION OF GUARDRAIL END TREATMENTS Categories of assets tracked in a typical maintenance management system include drainage structures, roadside features (e.g., fences, landscaping, sound barriers) , pavements, traffic items (e.g., signs, pavement markings, guardrails, impact attenuators)
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From page 99... ...
ROUTINE IN-SERVICE EVALUATION OF ROADSIDE DEVICES 99 work reporting, as proposed in the NCHRP Report 490 and TTI procedures. • Condition assessment surveys that check roadside safety features for incorrect installation or maintenance and for design types not suitable for their locations.
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From page 100... ...
100 PERFORMANCE EVALUATION OF GUARDRAIL END TREATMENTS as obstacles to in-service evaluation. Only two of 10 agencies interviewed reported that they had arrangements to receive notification of crashes directly from police on a routine basis (Heimbecker and Lohrey 2016, 43, 45)
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From page 101... ...
ROUTINE IN-SERVICE EVALUATION OF ROADSIDE DEVICES 101 The NCHRP Report 490 procedure does not specify a second stage for increased scrutiny of selected devices. • The TTI procedure's forms for recording information about crashes involving roadside devices are much less detailed than the NCHRP Report 490 forms.
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From page 102... ...
102 PERFORMANCE EVALUATION OF GUARDRAIL END TREATMENTS check for the occurrence on the state's highway system of installation and maintenance conditions that were identified as sources of performance limitations in the 2015 AASHTO-FHWA Task Force investigations of end treatment crashes (see Chapter 3) ; • A series of crash investigations as case studies for in-depth examination of a particular performance concern; and • A trial installation of a new device.
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From page 103... ...
ROUTINE IN-SERVICE EVALUATION OF ROADSIDE DEVICES 103 REFERENCES Abbreviations AASHTO American Association of State Highway and Transportation Officials FHWA Federal Highway Administration AASHTO.
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