United States Department of Transportation
i
Evaluation of Guardrail Performance in High-Risk Accident Zones on Georgia Roadways and Identification of Alternative Barriers
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2021-11-01
[PDF-1.60 MB]
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Edition:Final Report (August 2019 – November 2021)
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Abstract:W-beam guardrail systems are the predominant roadside safety barrier used on Georgia highways. These systems are usually installed in accordance with guidelines for the Midwest Guardrail System and generally perform very well across the state. However, in certain areas of high traffic volume in Georgia, repetitive accident locations may benefit from the installation of alternative systems rather than the traditional guardrail system. The objective of this research project is to identify representative high-accident-rate (or “high-risk”) zones in Georgia and evaluate the type and effectiveness of the barrier system deployed in these areas. Twenty-eight (28) freeway and freeway-ramp sections with frequent roadside-barrier collisions were identified in Georgia. Road design, traffic, and crash records pertaining to the selected road sections were collected. Based on the collected information, a barrier crash-frequency model and a crash-severity model was developed through statistical regression. The regression models were used in the benefit cost analysis to determine whether a concrete barrier is a more economical alternative to the guardrail. Simple decision-making tool were developed for selecting cost-effective roadside barrier types.
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