Roadway Cross-Section Reallocation: A Guide (2023) / Chapter Skim
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Chapter 1: Introduction
Chapter 1: Introduction
Pages 1-7
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This Guide supports direct, objective conversations about street design among transportation professionals, decisionmakers, and the community. Whatever a community prioritizes -- equity, the environment, the local economy, or even parking -- this Guide can help ensure that those priorities are reflected in decisions about cross sections.
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Let community goals and city policies Figure S-1. Decision-Making Framework for Roadway Cross Sections.
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Consider Your Options Street space can be used in many ways. Understanding how cross-section elements affect outcomes helps communities identify the street design that meets their goals.
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Just as minimum lane widths are accepted as a safety need for vehicles, the Guide provides information on designing safer streets for pedestrians, bicyclists, and other users. Using this Guide and the proposed decision-making process will result in communities and decisionmakers building a transportation network that reflects multiple priorities while prioritizing safety for all users.
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This Guide presents a process for making community-minded decisions about street design, describes how street-design decisions affect communities, and clarifies how different street elements influence not just transportation outcomes, but livability, economic and environmental health, equity, and many other concerns. The Guide includes a framework that offers practitioners a straightforward way to consider all these community goals and choose a street cross section that serves everyone.
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The Decision-Making Framework introduces a new method for understanding the relationship between cross-section changes and vehicle capacity. This new method measures how removing a travel lane affects traffic throughout the day, moving beyond the benchmark of whether a project "works" operationally outside the peak period.
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Not only are the safety benefits for drivers overstated, but these designs also -- by increasing vehicular speed and exposing vulnerable road users to conflicts with drivers -- make streets less safe for people walking and bicycling. The full explanation for these impressions, rarely expressed directly even if widely accepted, is that keeping motorized traffic flowing is a higher priority for a public agency than safety.
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