Performance Evaluation of Al Jame’ Roundabout Using SIDRA

This paper evaluates the performance of a multi-lane
four legged modern roundabout operating in Muscat using SIDRA
model. The performance measures include Degree of Saturation
(DOS), average delay, and queue lengths. The geometric and traffic
data were used for model preparation. Gap acceptance parameters,
critical gap and follow up headway, were used for calibration of
SIDRA model. The results from the analysis showed that currently
the roundabout is experiencing delays up to 610 seconds per vehicle
with DOS 1.67 during peak hour. Further, sensitivity analysis for
general and roundabout parameters was performed, amongst lane
width, cruise speed, inscribed diameter, entry radius and entry angle
showed that inscribed diameter is most crucial factor affecting delay
and DOS. Up gradation of roundabout to fully signalized junction
was found as the suitable solution which will serve for future years
with LOS C for design year having DOS of 0.9 with average control
delay of 51.9 seconds per vehicle.

• D. Muley
• H. S. Al-Mandhari

• Performance analysis
• roundabout
• sensitivity analysis
• SIDRA.

[1] I. M. Mazharul, and A. Y. S. Al Hadhrami, “Increased Motorization and
Road Traffic Accidents in Oman, ” Journal of Emerging Trends in
Economics & Management Sciences, vol. 3, no 6, pp 907-914, 2012.
[2] R. Akçelik, “Some common and differing aspects of alternative models
for roundabout capacity and performance evaluation,” International
Roundabout Conference, Transportation Research Board, Carmel,
Indiana, USA, May 2011.
[3] F. Xu, and Z. Z. Tian, “Driver Behavior and Gap-Acceptance
Characteristics at Roundabouts in California,” Transportation Research
Record: Journal of the Transportation Research Board, No. 2071, pp
117–124, 2008.
[4] I. Chang, S. Y. Ahn, and J. S. Hahn, “Analysis of Delay Reduction
Effects on Modern Roundabouts according to the Entry Traffic
Volume,” KSCE Journal of Civil Engineering, vol. 17, no 7, pp 1782-
1787, 2013.
[5] V. Sisiopiku, and H. Oh, “Evaluation of Roundabout Performance Using
SIDRA,” Journal of Transportation Engineering, vol. 127, no. 2,
pp143–150, March/April 2001.
[6] S. Manage, K. Suzuki, H. Nakamura, “Performance Analysis Of
Roundabouts As An Alternative For Intersection Control In Japan,”
Journal of the Eastern Asia Society for Transportation Studies, vol.5,pp
871 – 883, 2003.
[7] A. Ekman, “Calibration of traffic models in SIDRA,” Department of
Science and Technology, Linköping University, Sweden, Thesis, 2013.
[8] Z. Li, M. DeAmico, M. V. Chitturi, A. R. Bill, and D. A. Noyce,
“Calibration of VISSIM Roundabout Model: A Critical Gap and Followup
Headway Approach,” In Proc. TRB 92nd Annual Meeting,
Washington, D.C., January, 2013.
[9] R. Akçelik, “Lane-by-lane modelling of unequal lane use and flares at
roundabouts and signalised intersections: the SIDRA solution,” Traffic
Engineering + Control, vol. 38, no. 7/8, pp. 388–399, 1997.
[10] SIDRA, “Quick guide to SIDRA intersection 6,”Akçelik& Associates
Pty Ltd, Australia, 2014.
[11] TRB, “NCHRP Report 572 Roundabouts in United States,” National
Cooperative Highway Research Program, Transportation Research
Board, Washington, D.C., 2007.
[12] H. K. Myre, “Praktisk uttesting av SIDRA for å vurdere kapasitets- og
avviklingsforhold i rundkjøringer” Norgesteknisk-Naturvitenskapelige
Universitet, NTNU, 2010.