Journal ArticleDOI
Safety Effect of Roundabout Conversions in the United States: Empirical Bayes Observational Before-After Study
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TLDR
A before-after study was conducted using the empirical Bayes procedure, which accounts for regression to the mean and traffic volume changes that usually accompany conversion of intersections to roundabouts and suggests that roundabout installation should be strongly promoted as an effective safety treatment for intersections.Abstract:
Modern roundabouts are designed to control traffic flow at intersections without the use of stop signs or traffic signals. U.S. experience with modern roundabouts is rather limited to date, but in recent years there has been growing interest in their potential benefits and a relatively large increase in roundabout construction. This interest has created a need for data regarding the safety effect of roundabouts. Changes in motor vehicle crashes following conversion of 23 intersections from stop sign and traffic signal control to modern roundabouts are evaluated. The settings, located in seven states, are a mix of urban, suburban, and rural environments with the urban sample consisting of both single-lane and multilane designs and the rural sample consisting of only single-lane designs. A before-after study was conducted using the empirical Bayes procedure, which accounts for regression to the mean and traffic volume changes that usually accompany conversion of intersections to roundabouts. For the 23 inte...read more
Citations
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Journal ArticleDOI
A multiagent approach to autonomous intersection management
Kurt Dresner,Peter Stone +1 more
TL;DR: This article suggests an alternative mechanism for coordinating the movement of autonomous vehicles through intersections and demonstrates in simulation that this new mechanism has the potential to significantly outperform current intersection control technology--traffic lights and stop signs.
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Empirical Bayes before–after safety studies: Lessons learned from two decades of experience and future directions
Bhagwant Persaud,Craig Lyon +1 more
TL;DR: This paper is to capitalize on experience gained from two decades of conducting EB studies around the world to illustrate that the EB methodology, if properly undertaken, produces results that could be substantially different and less biased than those from more conventional types of studies.
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Application of the Conway–Maxwell–Poisson generalized linear model for analyzing motor vehicle crashes
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Evaluating effects of traffic and vehicle characteristics on vehicular emissions near traffic intersections
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Crash reduction following installation of centerline rumble strips on rural two-lane roads.
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References
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Book
Observational Before-After Studies in Road Safety
TL;DR: In this paper, a three part monograph includes: the essentials; adaptations of conventional approaches; and elements of a new approach, which enables road safety researchers and professionals to interpret correctly the results of one of the main sources of knowledge about road safety engineering measures.
Roundabouts : an informational guide
B W Robinson,Lee Rodegerdts,W Scarborough,Wayne Kittelson,Rod Troutbeck,Werner Brilon,L Bondzio,K Courage,Michael Kyte,John M Mason Jr,Aimee Flannery,Edward Myers,Jonathan M. Bunker,G Jacquemart +13 more
TL;DR: This guide is comprehensive in recognition of the diverse needs of transportation professionals and the public for introductory material through design detail, as well as the wide range of potential applications of roundabout intersections.
Journal ArticleDOI
The effects on safety, time consumption and environment of large scale use of roundabouts in an urban area: a case study
Christer Hydén,Andras Varhelyi +1 more
TL;DR: The study showed that details in the design are of decisive importance for road-users' safety and that the roundabouts in a Swedish city worked almost as good as they did shortly after the rebuilding.
Journal ArticleDOI
Classifying urban crashes for countermeasure development.
TL;DR: Potential countermeasures are discussed based on the predominant crash types identified in this study, which might be reduced by changes in signal timing, providing all-red signal intervals, increasing sign visibility, and increasing sight distances.
Journal Article
Estimation of safety at two-way stop-controlled intersections on rural highways
James A Bonneson,Patrick T McCoy +1 more
TL;DR: In this article, the application of the generalized linear modeling approach to the development of a model relating unsignalized intersection traffic demands to accident frequency is described, and several techniques for assessing model fit have been described and any inherent limitations noted.