Guide for Pedestrian and Bicyclist Safety at Alternative and Other Intersections and Interchanges (2021) / Chapter Skim
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1-1 This document presents a guide for pedestrian and bicycle safety at alternative intersections and interchanges (A.I.I.) , based on NCHRP Project 07-25.
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1-2 Guide for Pedestrian and Bicyclist Safety at Alternative and Other Intersections and Interchanges 2. Documenting, for each A.I.I.
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Introduction 1-3 1.2.2 Potential A.I.I. Benefits A.I.I.s reconfigure the geometric design of an intersection or interchange to improve operations and safety.
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1-4 Guide for Pedestrian and Bicyclist Safety at Alternative and Other Intersections and Interchanges 1.2.4 Pedestrians and Bicyclists at A.I.I.s Because many A.I.I.s are relatively new concepts developed to address issues for motorized vehicular traffic, the historical focus has been on the details of the geometric design for motor vehicle traffic to facilitate designs that are safe and intuitive for people driving. As a consequence, design for people walking and biking at many existing A.I.I.s has either been an afterthought or been incorporated too late in the design process, meaning insufficient design elements for biking and walking were incorporated into the remaining space within the planned right-ofway.
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Introduction 1-5 partial DLT as presented (two displaced left-turns) rather than a full DLT (four displaced leftturns)
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1-6 Guide for Pedestrian and Bicyclist Safety at Alternative and Other Intersections and Interchanges 1.3 Design and Evaluation Process The process for design and evaluation in this guidebook is structured to support ICE using a performance-based design approach. This section discusses these two aspects as they relate to pedestrian and bicyclist design at A.I.I.s.
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Introduction 1-7 1.3.2.1 Identify Intended Outcomes At ICE Stage 1, the intended outcome for motor vehicle operational performance is usually based on the desired target of capacity, volume-to-capacity ratio, or level of service for motorists. Sometimes, rather than meeting the desired target, the screening process may simply identify those alternatives that get the best performance possible for motorists based on the constraints of the project regarding potential impacts, financial constraints, or other factors.
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1-8 Guide for Pedestrian and Bicyclist Safety at Alternative and Other Intersections and Interchanges through the intersection more accurately. At Stage 2, the designer may want to evaluate different geometric configurations to determine what is best for safety and operations for all users.
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Introduction 1-9 • Adequately accommodate the design vehicles; • Meet the needs of pedestrians and bicyclists; and • Provide appropriate sight distance and visibility.
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1-10 Guide for Pedestrian and Bicyclist Safety at Alternative and Other Intersections and Interchanges – Chapter 3: "Bicycles," summarizes bicyclist characteristics and safety considerations, with added consideration for facility selection based on FHWA guidance. – Chapter 4: "Assessment," introduces and discusses the two-stage assessment framework for pedestrian and bicycle safety at A.I.I.s in an ICE context.
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