Selecting Ramp Design Speeds, Volume 2: Conduct of Research Report (2021) / Chapter Skim
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1 Summary The design speed concept has been the centerpiece of American Association of State Highway and Transportation Officials (AASHTO's) geometric design policy since the 1930s.
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2 statistical analyses were conducted to develop ramp speed prediction models for curves and tangents. While developing the RSPM tool, the research team also developed an initial set of enhanced guidelines for selecting an appropriate ramp design speed.
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