Design speed is used to determine all pertinent highway features to obtain a balanced design. Over an extended length of highway, it is desirable to select a uniform design speed. The TRB National Cooperative Highway Research Program’s NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Vol. 1: Guide provides guidelines for selecting appropriate design speeds specifically for ramps, based on a combination of contextual considerations and quantitative information. Supplemental to the document is a …
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