Safety Performance Evaluation of the New Mega Elliptical Roundabout Interchanges Using the Surrogate Safety Assessment Model
Publication: Journal of Transportation Engineering, Part A: Systems
Volume 146, Issue 12
Abstract
Mega elliptical roundabouts are considered a new kind of intersection and can be found on rural multilane highways. Their form is that of an elongated ellipse. They combine the best advantages of an unconventional median U-turn intersection and roundabout. The purpose of this research is analyzing safety performance for mega elliptical roundabout interchange using the VISSIM software version 4.30 and the surrogate safety assessment model (SSAM) software version 3. This research also considered eight other interchange designs to compare them with the mega elliptical roundabout interchange. In total, 20 scenarios were analyzed using VISSIM version 4.30 then tested by SSAM software version 3. To compare the different interchanges in terms of the mean values of conflicts, the one-way analyses of variance (ANOVA) were conducted. Based on the research results, a mega elliptical roundabout interchange was one of the best interchanges studied in this research in relation to the frequency of conflicts as a total and the frequency of crossing conflicts.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (specifically the SYNCHRO version 10, VISSIM version 4.30, and SSAM version 3 models).
Acknowledgments
The first author thanks the Ministry of Education of China for the Ph.D. scholarship they provided under CSC grant (No. 2017GBJ001910). Also, this project was financially supported by grants from the National Key R & D Program of China (No. 2017YFC0803907) and the MOE Project of Humanities and Social Sciences, China (No. 16YJCZH114).
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Journal of Transportation Engineering, Part A: Systems
Volume 146 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 3, 2020
Accepted: Jul 17, 2020
Published online: Sep 29, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 28, 2021
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