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Selection of a design speed should be based upon the anticipated operating speed, topography, adjacent land use, modal mix, and functional classification of the roadway.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Volume 1: Guide provides further detail for selecting an appropriate ramp design speed than presented in the 2018 Green Book, to address several overarching challenges that may lead to confusion or inconsistent interpretation of existing AASHTO guidance for selecting an appropriate ramp design speed.

Supplemental to the document are NCHRP Web-Only Document 313: Selecting Ramp Design Speeds,Volume 2: Conduct of Research Report and Ramp Speed Profile Model worksheets.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2021. Selecting Ramp Design Speeds, Volume 1: Guide. Washington, DC: The National Academies Press. https://doi.org/10.17226/26415.

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Publication Info

136 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26415
Chapters skim
Front Matter i-vi
Summary 1-2
Section 1. Introduction 3-22
Section 2. Ramp Elements Related to Ramp Design Speed 23-39
Section 3. Guidelines for Designing Ramps in a Consistent Manner Based on the Selected Ramp Design Speed 40-56
Section 4. Design Tool to Evaluate Ramp Designs for Consistency with the Selected Ramp Design Speed 57-91
Section 5. Case Studies 92-121
Section 6. Summary of Design Guide and Future Research Needs 122-125
Section 7. References 126-126
Section 8. Abbreviations, Acronyms, Initialisms, and Symbols 127-129

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