FHWA Safety Program’s Road Diet Informational Guide
This comprehensive guide covers the full range of road diet considerations well beyond their proven safety benefits. The guide details the history of road diets, the reasons to consider implementing a road diet, how to determine the feasibility of a project, how to design a road diet, and how to measure the effectiveness of a project. The effects on various modes including rail and freight are laid out, as well as operational and capital concerns such as LOS and ROW acquisition. A pdf version of the guide is also available here.

Road Diet Handbook: Setting Trends for Livable Streets
This monograph is intended as a practitioner’s comprehensive guide for decision-making on the applicability of road diets and as a guidebook on the implementation of road diets. The monograph addresses safety, traffic operations, and livability impacts and provides design guidelines for implementing road diet projects and optional design enhancements to consider that complement road diet projects.

FHWA Proven Safety Countermeasures: “Road Diet” (Roadway Configuration)
This is a pre-intervention guide to evaluating a potential “road diet”. It is important to analyze and understand the effects of the proposed change, obtain input from the community stakeholders, and ensure the appropriate elements are included in the project. Improvements to intersection turn lanes, signing, pavement markings, traffic control devices, transit stops, and pedestrian and bicyclist facilities may be needed to support this concept. The audience best served by this report are planners, roadway designers, and transportation engineers, whether at the state or local level.

Evaluation of Lane Reduction “Road Diet” Measures on Crashes
This Highway Safety Information System (HSIS) summary replaces an earlier one, Evaluation of Lane Reduction “Road Diet” Measures and Their Effects on Crashes and Injuries (FHWA-HRT-04-082), describing an evaluation of “road diet” treatments in Washington and California cities. This summary reexamines those data using more advanced study techniques and adds an analysis of road diet sites in smaller urban communities in Iowa. This report is useful as a metric for planners, roadway designers, and transportation engineers when considering the size, or type of conversion necessary for a project.

Safety and Operational Analysis of 4-Lane to 3-Lane Conversions (Road Diets) in Michigan
Road diets, specifically 4-to-3 lane conversions, implemented in various locations in Michigan were studied to determine the safety- and delay-related impacts, develop crash modification factors (CMFs), and develop guidelines that would be useful in deciding when it might be desirable to implement such road diets. A study-by-study literature review and suggestions for implementation strategies are also included. Useful for traffic engineers and planning practitioners in state and local DOTs.

Evaluation of Lane Reduction “Road Diet” Measures on Crashes and Injuries
A study was conducted to investigate the actual effects of road diets on motor vehicle crashes and injuries. Twelve road diets and 25 comparison sites in California and Washington cities were analyzed. Applications of this report can be directed toward design, data analysis, and evaluation. This report would best serve traffic engineers, transportation professionals in state and local DOTs.

The Safety and Operational Effects of Road Diet Conversion in Minnesota
Research was undertaken to explore the safety and operational effects of converting four-lane undivided roadways to three-lanes with a center two-way left turn lane (TWLTL) in Minnesota. This report is most useful for other transportation planning agencies on the state and local levels.

Road Diets: Fixing the Big Roads
Roadway conversions discussed here may be just the ticket to start remaking unhealthy, unsafe city neighborhoods or commercial districts and turn them into more robust, vital, economically sound places. Road conversion may be undertaken to create safer, more efficient ways to provide access and mobility for pedestrians, bicycle riders and transit users, as well as motorists. They improve livability and quality of life for residents and shoppers. Just as with human diets, road diets without doctors’ (transportation planners and engineers) analyses and prescriptions, might be foolhardy. This document provides some of the recommended analysis of best practice road diet conversions, and is best utilized by transportation planners, engineers, local and state government actors, and community members.

Designing Walkable Urban Thoroughfares: A Context Sensitive Approach
This report has been developed in response to widespread interest for improving both mobility choices and community character through a commitment to creating and enhancing walkable communities. Many agencies will work towards these goals using the concepts and principles in this report to ensure the users, community and other key factors are considered in the planning and design processes used to develop walkable urban thoroughfares.

Pedestrian & Bicycle Safety
Livable communities are a high priority of the U.S. Department of Transportation and the Obama Administration. A livable community is one that provides safe and convenient transportation choices to all citizens, whether it’s by walking, bicycling, transit, or driving. Pedestrian safety improvements depend on an integrated approach that involves the 4 E’s: Engineering, Enforcement, Education, and Emergency Services. The FHWA’s Office of Safety develops projects, programs and materials for use in reducing pedestrian and bicyclist fatalities. This guide is ideal for safety practitioners.

AASHTO Guide for the Planning, Design, and Operation of Pedestrian Facilities, 1st Edition
The purpose of this guide is to provide guidance on the planning, design, and operation of pedestrian facilities along streets and highways. Specifically, the guide focuses on identifying effective measures for accommodating pedestrians on public rights-of-way. Appropriate methods for accommodating pedestrians, which vary among roadway and facility types, are described in this guide. The primary audiences for this manual are planners, roadway designers, and transportation engineers, whether at the state or local level, the majority of whom make decisions on a daily basis that affect pedestrians. This guide also recognizes the profound effect that land use planning and site design have on pedestrian mobility and addresses these topics as well.

Accident Modification Factors for Traffic Engineering and Its Improvement
This report presents the findings of a research project to develop accident modification factors (AMFs) for traffic engineering and ITS improvements. AMFs are a tool for quickly estimating the impact of safety improvements. The report will be of particular interest to safety practitioners responsible for programming and implementing highway safety improvements.

Restructuring the Commercial Strip
In the last 50 years, commercial strip corridors have accounted for a substantial amount of retail and development activity in the United States, but in many communities, commercial strip corridors are aging and many of them are losing their attractiveness as development locations. Despite disinvestment, these corridors remain key parts of regional transportation networks and are often well positioned for reuse and redevelopment because of the high volumes of traffic that they continue to experience. This document is meant to provide communities with guidance on how they can revitalize these commercial corridors to accommodate economic growth, reuse land already serviced by existing infrastructure, and reflect the unique character of the town or city where they are located. This information can best serve a wide audience: state and local government, planners, developers, community leaders and organizers, and those interested in real estate.

More Rightsizing Case Studies and Resources


Further Reading on Rightsizing was last modified: December 4th, 2014 by Sara Allen