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Designing extended sections of highway based on the design speed process is relatively straightforward. However, when applied to interchange ramps where high-speed facilities meet low-speed facilities and drivers are expected to accelerate or decelerate over short distances, application of the design speed process is more complex.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Volume 2: Conduct of Research Report provides enhanced design guidelines for selecting appropriate ramp design speeds in a consistent manner, accounting for sequential speed transitions from one component or section to the next, consistent with performance capabilities of vehicles and driver expectations.

Supplemental to the document are NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Volume 1: Guide and Ramp Speed Profile Model figures.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2021. Selecting Ramp Design Speeds, Volume 2: Conduct of Research Report. Washington, DC: The National Academies Press. https://doi.org/10.17226/26414.

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Publication Info

160 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26414
Chapters skim
Front Matter i-vi
Summary 1-2
Section 1. Introduction 3-7
Section 2. Literature Review and Survey of Practice 8-59
Section 3. Observational Field Study 60-67
Section 4. Development of Ramp Speed Prediction Models 68-86
Section 5. Summary of Design Guidelines 87-92
Section 6. Project Summary and Future Research Needs 93-95
Section 7. References 96-98
Section 8. Abbreviations, Acronyms, Initialisms, and Symbols 99-101
Appendix A. Suggested Text for Future Edition of AASHTO Green Book 102-153

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