Author(s):
G.D. Weaver, E.L. Marquis
Publication Date
October 1973
Abstract
The design engineer has been handicapped by the lack of objective criteria in the area of selecting safe combinations of slopes for roadway design. To enable him to evaluate alternatives and thus achieve optimum roadside safety in his design, objective criteria must be made available to him.|Three regions of the roadside are particularly important when evaluating the safety aspects: (1) the top of the slope (hinge-point); (2) the front slope, and (3) the toe-of-slope (intersection of the front slope with level ground, or with a back slope forming a ditch). Each region affects vehicle response in a different way and for a different set of operating conditions. When individual criteria are determined for each, the pieces may be put together to produce safety guidelines for total roadside slope design.|The study reported here addressed the toe-of-slope region with particular emphasis on safe combinations of slopes forming various ditch shapes. The work was conducted in two parts involving mathematical simulation and full-scale testing. This phase documents, in a single report, the findings and recommendations from the first two phases and presents recommended design criteria for selection of safe combinations of roadside slopes.
Report Number:
RF 626B
Link(s):
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