Roundabouts with Unbalanced Flow Patterns Rahmi Akçelik Akcelik and Associates Pty Ltd PO Box 1075G, Greythorn Victoria 3104, Australia Phone: +613 9857 9351 Fax: +613 9857 5397 Email: rahmi@akcelik.com.au Paper presented at the Institute of Transportation Engineers 2004 Annual Meeting, Lake Buena Vista, Florida, USA, August 1-4, 2004 Revised: 25 August 2004 ♦ Right-hand version figures with US customary units and additional material included for some case studies (see the Appendix after references). ♦ Some data tables extended to include data in both metric and US customary units. ♦ Critical lanes in Table 5 are better identified, and Equation 4 corrected. Revised: 6 May 2005 ♦ Moore St and Fitzsimons Lane roundabout cases revised and US case results added in the Appendix (U-turns shown in figures for Moore St roundabout).