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We study the generic non-equilibrium steady states in asymmetric exclusionprocesses on a closed network with bottlenecks. To this end we proposes andstudy closed simple networks with multiply-connected non-identical junctions.Depending upon the parameters that define the network junctions and theparticle number density, the models display phase transitions with both staticand moving density inhomogeneities. The currents in the models can be tuned bythe junction parameters. Our models highlight how extended and point defectsmay affect the density profiles in a closed directed network. Phenomenologicalimplications of our results are discussed.

Asymmetric exclusion processes on a closed network with bottlenecks