Research topic

Roundabouts

55 publications, 1983 to 2025.

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2025
SIDRA Roundabout Presentation - TORUS Webinar Nov 2025
R. Akçelik Presentation
2025
A Roundabout Capacity Survey Method Using Gap Acceptance Cycles and Vehicle Trajectory Data
G. Chun, N.M. Rouphail, R. Akçelik Technical note
2025
New Survey Method for Calibration of Roundabout Capacity Models
G. Chun, N.M. Rouphail, R. Akçelik Presentation
2025
A New Roundabout Capacity Survey Method
G. Chun, N.M. Rouphail, R. Akçelik Presentation
2024
SIDRA Multimodal Capacity and Performance Analysis for Roundabouts
R. Akçelik Presentation
2022
A Comparative Analysis of Exponential and Linear Roundabout Capacity Models Using HCM Research Data
R. Akçelik, C. Shirke, M. Besley, I. Espada, D. Billinghurst Presentation
2022
HCM 6 Extended Roundabout Capacity Model in SIDRA INTERSECTION
Akcelik & Associates Presentation
2019
Comparing Roundabout and Metered Roundabout Performance under Different Traffic Conditions
A. Abdelfatah, M. Alozn Journal article
2018
Gap Acceptance Cycles for Modelling Roundabout Capacity and Performance
R. Akçelik Conference paper
2018
Comparing Common Control Group treatment and signal coordination of intersections with separate controllers
R. Akçelik, M. Besley Presentation
2017
Roundabouts Lessons Learned
S. Thieken Presentation
2017
Roundabout Model Comparison Table
R. Akçelik Reference
2017
An Assessment of the Highway Capacity Manual Edition 6 Roundabout Capacity Model
R. Akçelik Conference paper
2017
A Comparison of Two Roundabout Capacity Models
E. Macioszek, R. Akçelik Conference paper
2015
Roundabouts in Australia: the state of the art on models and applications
R. Akçelik Presentation
2015
Alternative Intersection Analysis Using SIDRA INTERSECTION
R. Akçelik, M. Besley Presentation
2014
Recalibration of a vehicle power model for fuel and emission estimation and its effect on assessment of alternative intersection treatments
R. Akçelik, R. Smit, M. Besley Conference paper
2014
Modelling Queue Spillback and Nearby Signal Effects in a Roundabout Corridor
R. Akçelik Conference paper
2014
Analysis of Fuel Consumption and Emissions at Roundabout with Slip Lane, using SIDRA and Validation by MOVES Simulation
M. Al-Ghandour Conference paper
2013
Lane-Based Micro-Analytical Model of a Roundabout Corridor
R. Akçelik Conference paper
2011
Some Common and Differing Aspects of Alternative Models for Roundabout Capacity and Performance Estimation
R. Akçelik Conference paper
2011
Roundabout Metering Signals: Capacity, Performance and Timing
R. Akçelik Conference paper
2011
Roundabout Design and Capacity Analysis in Australia and New Zealand
R. Akçelik Presentation
2011
ROUNDABOUTS - Comments on the SIDRA INTERSECTION Model and the TRL (UK) Linear Regression Model
R. Akçelik Paper
2011
Analysis of Single-Lane Roundabout Slip Lanes using SIDRA
M.N. Al-Ghandour, W.J. Rasdorf, B.M. Williams, B.J. Schroeder Conference paper
2011
An assessment of the Highway Capacity Manual 2010 roundabout capacity model
R. Akçelik Conference paper
2009
Evaluating Roundabout Capacity, Level of Service and Performance
R. Akçelik Conference paper
2008
Speed Control at Roundabouts - use of Maximum Entry Path Radii
O. Arndt Conference paper
2008
Roundabouts in Australia
R. Akçelik Conference paper
2008
An Investigation of the Performance of Roundabouts with Metering Signals
R. Akçelik Conference paper
2006
Operating Cost, Fuel Consumption and Pollutant Emission Savings at a Roundabout with METERING SIGNALS
R. Akçelik Conference paper
2005
Roundabouts with Metering Signals
E. Natalizio Conference paper
2005
Roundabout Model Calibration Issues and a Case Study
R. Akçelik Conference paper
2005
Capacity and Performance Analysis of Roundabout Metering Signals
R. Akçelik Conference paper
2004
Roundabouts with Unbalanced Flow Patterns
R. Akçelik Conference paper
2004
Differences between the AUSTROADS Roundabout Guide and aaSIDRA Roundabout Analysis Methods
R. Akçelik, M. Besley Journal article
2003
Speed - Flow and Bunching Relationships for Uninterrupted Flows
R. Akçelik Conference paper
2003
A Roundabout Case Study Comparing Capacity Estimates from Alternative Analytical Models
R. Akçelik Conference paper
2002
Roundabout Studies in Kansas
E.R. Russell, G. Luttrell, M. Rys Conference paper
2002
Estimating Negotiation Radius, Distance and Speed for Vehicles using Roundabouts
R. Akçelik Conference paper
2002
Establishing Roundabout Guidelines for a State DOT
C.S. Kinzel Conference paper
2001
Evaluation of Roundabout Performance using SIDRA
V.P. Sisiopiku, H. Oh Journal article
2000
On the Validity of Some Traffic Engineering Folklore
R. Akçelik Conference paper
1998
Roundabout Capacity and Performance
R. Akçelik Presentation
1998
Modern Roundabout Practice in the United States
G. Jacquemart Paper
1998
A Comparison of Three Delay Models for Sign-Controlled Intersections and Roundabouts
R. Akçelik, B. Christensen, E. Chung Journal article
1997
Three-Laning a Two-Lane Roundabout - The Outcomes
A. O'Brien, R. Akçelik, D. Williamson, T. Pantas Conference paper
1997
Lane-By-Lane Modelling of Unequal Lane use and Flares at Roundabouts and Signalised Intersections: The SIDRA Solution
R. Akçelik Paper
1997
Analysis of Roundabout Performance by Modelling Approach Flow Interactions
R. Akçelik, E. Chung, M. Besley Conference paper
1996
Performance of Roundabouts under Heavy Demand Conditions
R. Akçelik, E. Chung, M. Besley Journal article
1996
ARCADY Health Warning: Account for Unequal Lane Usage or Risk Damaging the Public Purse!
B. Chard Journal article
1995
Not "the greatest new development in traffic engineering since the traffic signal"
R. Akçelik Journal article
1992
Comparison of Roundabout Capacity and Delay Estimates from Analytical and Simulation Models
E. Chung, W. Young, R. Akçelik Conference paper
1991
Implementations of the Australian Roundabout Analysis Method in SIDRA
R. Akçelik, R. Troutbeck Conference paper
1983
Appraisal of Eight Small Area Traffic Management Tools
J.Y.K. Luk, R. Akçelik, D.P. Bowyer, R.E. Brindle Paper

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