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Development and Testing of an Approach Guardrail Transition to a Single Slope Concrete Median Barrier




Ketil Soyland, Ronald Faller, Dean Sicking, Jim Holloway




An approach guardrail transition for use with the single slope concrete median barrier (CMB) was developed and crash tested. The transition was constructed with 10-gauge thrie beam guardrails and supported by nine W6x9 steel posts. A single slope connector plate was developed to connect the thrie beam to the single slope CMB and structural tube spacer blocks (TS 7x4x3/16) were incorporated for use with the thrie beam guardrail transition. Two full-scale vehicle crash tests were performed on Missouri's approach guardrail transition attached to a single slope concrete median barrier (CMB). The tests were conducted and reported in accordance with the requirements specified in the National Cooperative Highway Research Program (NCHRP) Report No. 350, Recommended Procedures for the safety Performance Evaluation of Highway Features. The safety performance of the approach guardrail transition attached to a single slope CMB was determined to be acceptable according to Test Level 3 of the NCHRP 350 criteria.


Single Slope Median Barrier, Single Slope Connector Plate, Highway Safety, Crash Tests

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