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Try to gain contact with L.G.H. Fortuijn MSc and P.J. Carton MSc (Board of Economy and Transport; Province of South Holland, I consider Fortuijn one of the "authorities" on multilane roundabouts. I know he has developed I/C algoritms on several variants of design of multilane roundabouts. They have produced a site you can visit: at http://www.pzh.nl <<Turbocircuits.url>> ing. Jan P. Vos MSc; Municipality of Amsterdam. > -----Oorspronkelijk bericht----- > Van: Alan J Horowitz [SMTP:[log in to unmask]] > Verzonden: vrijdag 8 juni 2001 22:09 > Aan: [log in to unmask] > Onderwerp: Multilane Roundabouts > > A student of mine and I have been trying to expand upon the capacity > relationships for one-lane roundabouts found in the US Highway Capacity > Manual (HCM). The HCM essentially treats roundabouts as a series > of yield signs on entering approaches. Roundabouts are rather new > in the US and we have been having difficulty finding any information on > how the HCM procedure might extend to multilane roundabouts. A critical > element for such a procedure would seem to be the lane distribution of the > circulating traffic. Can you point us in the direction of literature that > might clarify this issue for us? > > Alan Horowitz > Professor of Civil Engineering > University of Wisconsin--Milwaukee