?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F20155%2F&rft.title=A+Service+Life+Analysis+of+Roundabouts+Retrofits+for+Signalized+Intersections&rft.creator=YANG%2C+XINYI&rft.description=Roundabouts+have+long+been+regarded+as+an+effective+traffic+control+method.+While+this+method+is+quite+popular+in+some+foreign+countries+like+Australia%2C+there+are+not+as+many+existing+roundabout+sites+in+the+U.S.+According+to+foreign+experiences+and+limited+experience+in+the+U.S.%2C+roundabouts+can+be+good+replacement+alternatives+where+signalized+intersections+no+longer+function+well.+%0D%0AThis+thesis+examined+and+monetized+the+potential+benefits+of+converting+signalized+intersections+to+roundabouts+under+three+different+circumstances.+To+be+specific%2C+the+potential+benefits+included+crash+reduction%2C+delay+time+reduction%2C+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%2C+that+are+currently+signalized%2C+were+studied+to+determine+the+BCA.+After+a+systematic+evaluation%2C+it+was+found+that+a+five-way+intersection+with+moderate+traffic+volume+had+the+best+benefit-cost+ratio+among+all+three+intersections+studied.&rft.date=2014-01-29&rft.type=University+of+Pittsburgh+ETD&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F20155%2F4%2Fxinyi_etd2013.pdf&rft.identifier=++YANG%2C+XINYI++(2014)+A+Service+Life+Analysis+of+Roundabouts+Retrofits+for+Signalized+Intersections.++Master's+Thesis%2C+University+of+Pittsburgh.++++(Unpublished)++