Selecting Ramp Design Speeds, Volume 2: Conduct of Research Report (2021) / Chapter Skim
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3 Section 1. Introduction 1.1 Background In the 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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4 Table 2. Design Speed Guidelines for Ramps (Leisch, 2005)
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5 The rationale of AASHTO's current policy on ramp design speed is therefore in need of review. Guidance in the current Green Book is complex and may lead to insufficient or poor ramp designs.
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6 - Presence of ramp meters. - Ramp terminal configuration (e.g., tapered and parallel, presence of auxiliary lane)
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7 1.4 Outline of Report This report presents an overview of the work conducted in National Cooperative Highway Research Program (NCHRP) Project 15-56.
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