Whenever a guardrail terminates within the "clear zone," a crashworthy end treatment is required. To be crashworthy, the end-treatment should not spear, vault, or roll a vehicle during a head-on impact while maintaining vehicle decelerations below recommended limits. As a means of determining types of end treatments currently used in various states and criteria to determine what type to use, a survey letter was sent to each state.
It was found that, generally, the preferred method to use to end roadside steel beam guardrail is to bury the end in a cut slope. When this is not feasible, either a Breakaway Cable Terminal (BCT) or turned-down end treatment is generally used. While the BCT is used mos t often, some states use both, while others use only the turned-down end. There is considerable uniformity in the design of the BCT while there is a substantial diversity in the design of turned-down end treatments.
Recommendations were made concerning the type of end treatments which should be used in Kentucky for roadside steel beam guardrail. A design for a turneddown end treatment was proposed.
Digital Object Identifier
Pigman, Jerry G. and Agent, Kenneth R., "Survey of Guardrail End Treatment Usage" (1983). Kentucky Transportation Center Research Report. 981.