Module 8: Traffic Calming Case Studies

The following five case studies cover both (1) effective processes used to plan and define a local traffic calming program or project and (2) assessments of the effects of individual and series of traffic calming measures. A brief summary is provided for each case study, followed by a hyperlink to a report or other document that provides additional detail.

Case Study 8: Noteworthy Speed Management Practices

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A. References

• Fatality Analysis Reporting System.
• Federal Highway Administration. Technical Advisory, Pavement Friction Management, T 5040.38, June 17, 2010.
• American Association of State Highway Transportation Officials (AASHTO) Guide for Pavement Friction.

References - Procedures For Setting Advisory Speeds On Curves

References

1. Bonneson, J, M. Pratt, J. Miles, and P. Carlson. "Procedures for Setting Curve Advisory Speeds." FHWA/TX-09/5-5439-01-P1. Federal Highway Administration, U.S. Department of Transportation, Washington, D.C., and Texas Department of Transportation, Austin, Texas, 2009.

Chapter 2. Conveying Changes In Horizontal Alignment

2.1 Overview

This chapter provides a brief overview of topics related to horizontal curve safety, operation, and curve warning signs. It consists of three parts. The first part examines the safety and operation of horizontal curves. The second part reviews the various warning signs that are used to sign horizontal curves. The last part provides an overview of the Curve Advisory Speed (CAS) software that was developed to automate the procedures and criteria described in Chapters 3 and 4, respectively.

Chapter 1. Introduction - Procedures For Setting Advisory Speeds On Curves

1.1 Overview

Horizontal curves are a necessary component of the highway alignment; however, they tend to be associated with a disproportionate number of severe crashes. Recently, in the United States, about 33,000 fatalities occur nationwide each year, and about 25 percent of these fatalities occur on horizontal curves (2).

Procedures for Setting Advisory Speeds on Curves

June 2011

FHWA-SA-11-22

Appendix B. VSL Installations in the United States

Known installations of VSLs in the United States are presented below. For each installation the following information is provided: location, type of activation (manual, automated, hybrid), total length, type (regulatory, advisory), number of VSL signs, type of sensors, and current status. The installations are sorted first by current status, beginning with the active installations, and then by alphabetical order of the State in which the installation resides.

Appendix A. References

1. McGovern, C., P. Rusch, and D. Noyce, State Practices to Reduce Wet Weather Skidding Crashes, FHWA-SA-11-21, U.S.

Chapter 6. Weather-Related Variable Speed Limit Case Studies

In order to provide an in-depth analysis of the VSL systems and to obtain additional information on their use in wet weather and issues related to sight distance and stopping distance, various States with active VSL systems were interviewed. These States were chosen from the list of known U.S. installations of VSLs, which can be found in Appendix B, based on their relevance to the purpose of this guide, the level of experience each governing agency had with VSL systems, and the agency's willingness to share detailed information about their systems.