01019028

Component

http://onlinepubs.trb.org.../ec083/12_Ritchiepaper.pdf

The rising need of traffic control devices in sprawling suburban and rural areas, which are predominantly connected by higher speed roadways, as well as the rising awareness of the benefits of modern roundabouts has raised the common question in North America of whether roundabouts are appropriate at intersections with high speed approaches. This report identifies and evaluates the perceived concern of placing modern roundabouts on roadways or corridors with high-speed approaches (45 miles per hour or greater). The report takes an engineering standpoint of analyzing several roundabout case studies with high speed approaches found in North America. In short, this report answers the question of whether modern roundabouts are appropriate at intersections with high-speed approaches based on safety research. It also provides recommendations and elements of design for high-speed conditions that are crucial to the safety performance of modern roundabouts.

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01019098

English

56p

2005-12

Transportation Research Circular

National Roundabout Conference

Digital/other

Approach lanes; Approach roads; High speed ground transportation; Highway design; Highway safety; Highway traffic control; Intersections; Roundabouts; Traffic engineering

North America

Highways; Operations and Traffic Management; Railroads; Safety and Human Factors; I73: Traffic Control; I82: Accidents and Transport Infrastructure

TRIS, TRB

Feb 3 2006 3:01PM

• A Study of the Safety Effects of Signalizing Intersections on Colorado State Highways
• An Examination and Recommendation for Current Practices in Roundabout Lighting
• Analytical Analysis of Pedestrian Effects on Roundabout Exit Capacity
• Are Roundabouts Good for Business?
• Capacity and Performance Analysis of Roundabout Metering Signals
• Case Study: Blue Lake Roundabout (Humboldt County, California)
• Data Collection and Extraction
• Estimating Roundabout Performance using Delay and Conflict Opportunity Crash Prediction
• Evolution of Roundabouts in France and New Uses
• High-Capacity Roundabout Intersection Analysis: Going Around in Circles
• Impact Study: Conversion of Three Signalized Intersections and Three Stop-controlled Intersections to Modern Roundabouts on Cleveland Street in Clearwater, Florida
• Incorporating Exiting Vehicles in Capacity Estimation at Single-Lane U.S. Roundabouts
• Internationally Recognized Roundabout Signs
• Navigation Signing for Roundabouts
• Pedestrian Crosswalk Signals at Roundabouts: Where are they Applicable?
• Performance Analysis of Roundabouts in Strongly Constrained Environment. Case Studies in Urban Areas
• Review of Accident Research at Roundabouts
• Roundabout Access for Visually Impaired Pedestrians: Evaluation of a Yielding Vehicle Alerting System for Double-Lane Roundabouts
• Roundabout Model Calibration Issues and a Case Study
• Roundabouts : A State of the Art in Germany
• Roundabouts in Harford County, Maryland - A Local Perspective
• Safety Auditing Roundabouts
• Simulated Capacity of Roundabouts and Impact of Roundabout Within a Progressed Signalized Road
• The 'Sock Puppet' and Other Lessons Learned in Grand Junction, Colorado
• The Dimondale Mini: America’s First Mini-Roundabout
• The Safety of Roundabouts and Traffic Lights in Belgium