Trade-Off Considerations in Highway Geometric Design (2011) / Chapter Skim
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Pages 58-61
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56 CHAPTER FOUR CONCLUSIONS This synthesis is based on a literature review and survey responses from 43 agencies (41 state transportation agencies (STAs) , the District of Columbia, and Puerto Rico)
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57 Only five agencies have developed specific performance goals regarding the evaluation of trade-offs. Shoulder width was overwhelmingly the controlling criterion most often associated with a design exception request.
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58 documentation of the decision occurs and that the documentation is retained, as both crashes and tort claims may occur many years after the decisions and construction. As important as adequate documentation is a clearly understood decision process.
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59 add much-needed clarification to the safety and operational impacts of trade-offs associated with these criteria. Safety is a key rationale for all the controlling criteria except structural capacity and vertical clearance.
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