We consider the exclusion process on a ring with time-dependent defectivebonds at which the hoping rate periodically switches between zero and one. Thissystem models main roads in city traffics, intersecting with perpendicularstreets. We explore basic properties of the system, in particular dependence ofthe vehicular flow on the parameters of signalization as well as the systemsize and the car density. We investigate various types of the spatialdistribution of the vehicular density, and show existence of a shock profile.We also measure waiting time behind traffic lights, and examine itsrelationship with the traffic flow.
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