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Traffic circles and timing of traffic lights for cars flow
1.  Laboratoire des signaux et systèmes, Université ParisSud, CNRS, Supélec, 3, Rue JoliotCurie, 91192 GifsurYvette, France 
2.  Istituto per le Applicazioni del Calcolo "M. Picone", IACCNR, Viale del Policlinico 137, 00161 Roma, Italy 
To deal with this problem we consider a fluid dynamic model for traffic flow on a road network. The model is that proposed in [9] and is applied to the case of crossings with lights and with circles. For the first we consider timing of lights as control and determine the asymptotic fluxes. For the second we extend and complete the model of [9] introducing some right of way parameters. Also in this case we determine the asymptotic behavior.
We then compare the performances of the two solutions. Finally, we can indicate which choice is preferable, depending on traffic level and control necessity, and give indications on how to tune traffic light timing and traffic circle right of way parameters.
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