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A Service Life Analysis of Roundabouts Retrofits for Signalized Intersections

YANG, XINYI (2014) A Service Life Analysis of Roundabouts Retrofits for Signalized Intersections. Master's Thesis, University of Pittsburgh. (Unpublished)

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Roundabouts have long been regarded as an effective traffic control method. While this method is quite popular in some foreign countries like Australia, there are not as many existing roundabout sites in the U.S. According to foreign experiences and limited experience in the U.S., roundabouts can be good replacement alternatives where signalized intersections no longer function well.
This thesis examined and monetized the potential benefits of converting signalized intersections to roundabouts under three different circumstances. To be specific, the potential benefits included crash reduction, delay time reduction, fuel efficiency improvement and air pollutant reduction. Then a benefit-cost analysis (BCA) was conducted. The monetization of environmental benefits was used to improve the BCA methodology that has been used by others. Three different intersections, that are currently signalized, were studied to determine the BCA. After a systematic evaluation, it was found that a five-way intersection with moderate traffic volume had the best benefit-cost ratio among all three intersections studied.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
YANG, XINYIxiy40@pitt.eduXIY40
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorCasson, CASSON
Committee MemberMagalotti, MJM25
Committee MemberJohnson, Keith
Date: 29 January 2014
Date Type: Publication
Defense Date: 25 November 2013
Approval Date: 29 January 2014
Submission Date: 2 December 2013
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 101
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: roundabout, retrofits, benefit-cost
Date Deposited: 29 Jan 2014 15:09
Last Modified: 15 Nov 2016 14:16


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