Selecting Ramp Design Speeds, Volume 1: Guide (2021) / Chapter Skim
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1 Summary In the American Association of State Highway and Transportation Officials' (AASHTO) A Policy on Geometric Design of Highways and Streets, commonly referred to as the Green Book, design speed is defined as a selected speed used to determine the various geometric design features of the roadway (AASHTO, 2018)
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2 significantly affects vehicle speed. For direct connection and outer connection ramps, the sharpest curve on the ramp proper is considered the controlling curve.
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