Abstract
Conventional roundabouts have been prevalent worldwide since the emergence of modern roundabouts in 1966. An innovative design of multilane roundabouts known as turbo roundabouts, however, has been recently introduced as an alternative to conventional multilane roundabouts. Due to several reasons, there has been no general consensus on the operational performance of turbo roundabouts throughout the world. Nationwide, turbo roundabouts have yet to be part of roadway systems, but there is an ongoing project expected to be finished in early 2020. Therefore, this dissertation aims to evaluate the operational performance of a widespread variant of turbo roundabouts, namely basic turbo roundabouts, as compared with conventional double-lane roundabouts located across the State of Florida. Field data from three existing double-lane roundabouts was recently collected. A microsimulation analytical tool, namely VISSIM 11.00-02, was employed to develop base and alternative models. Operational performance measures of effectiveness included throughput volume, control delay, and maximum queue lengths. In addition, trajectory files automatically generated by VISSIM for vehicular traffic conflicts were considered using Surrogate Safety Assessment Model (SSAM3). Results indicated that basic turbo roundabouts with entry speed conforming to the Dutch standards of turbo roundabouts, namely 25 mph, provided slightly less capacity, quite comparable throughput volume for v/c ratios less than 0.70, fluctuating delay results, significantly lower traffic conflicts, and, for the most part, significantly shorter queue lengths.
Notes
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Graduation Date
2019
Semester
Fall
Advisor
Radwan, Ahmed
Degree
Doctor of Philosophy (Ph.D.)
College
College of Engineering and Computer Science
Department
Civil, Environmental, and Construction Engineering
Degree Program
Civil Engineering
Format
application/pdf
Identifier
CFE0008273; DP0023644
Language
English
Release Date
June 2023
Length of Campus-only Access
3 years
Access Status
Doctoral Dissertation (Open Access)
STARS Citation
Elhassy, Zuhair, "Basic Turbo Roundabouts as an Alternative to Conventional Double-lane Roundabouts: Operational Performance Evaluation" (2019). Electronic Theses and Dissertations. 6868.
https://stars.library.ucf.edu/etd/6868