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In this paper we consider the problem of estimating emissions due tovehicular traffic on complex networks, and minimizing their effect byregulating traffic at junctions. For the traffic evolution, we consider aGeneric Second Order Model, which encompasses the majority of two-equations(i.e. second-order) models available in the literature, and extend it to roadnetworks with merge and diverge junctions. The dynamics on the whole network isdetermined by selecting a solution to the Riemann Problems at junctions, i.e.the Cauchy problems with constant initial data on each incident road. Thelatter are solved assuming the maximization of the flow and assigning a trafficdistribution coefficient for outgoing roads of diverges, and a priority rulefor incoming roads of merges. A general emission model is considered and itsparameters are tuned to the NOx emission rate. The minimization of emissions isthen formulated in terms of the traffic distribution and priority parameters,taking into account travel times. A comparison is provided between roundaboutswith optimized parameters and traffic lights, which correspond to time-varyingtraffic priorities. Our approach can be adapted to manage traffic in complexnetworks in order to reduce emissions while keeping travel time at acceptablelevels.

Emissions minimization on road networks via Generic Second Order Models