Evaluation of the 13 Controlling Criteria for Geometric Design (2014) / Chapter Skim
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1 S U M M A R Y Evaluation of the 13 Controlling Criteria for Geometric Design The FHWA has, since 1985, designated 13 specific design elements as controlling criteria for roadway design. These are design speed, lane width, shoulder width, bridge width, structural capacity, horizontal alignment, vertical alignment, grade, stopping sight distance, cross slope, superelevation, vertical clearance, and horizontal clearance.
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2curve only when a horizontal curve, intersection, or driveway hidden from the view of approaching drivers by the crest vertical curve was present. • Through analysis of traffic speed data collected upstream of and within horizontal curves on rural multilane highways as part of this research a model was developed to predict the reduction in traffic speed on horizontal curves, in comparison to the traffic speed upstream of the curve, as a function of curve radius.
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