The effect of one on-ramp (entry) and one off-ramp (exit) is investigatednumerically in one dimensional-cellular automaton traffic flow model, with openboundary conditions, using parallel dynamics. Our aim in this paper is to studyhow the injecting rates $\alpha$ and $\alpha_{0}$ and the extracting rates$\beta$ and $\beta_{0}$ acts on the density and flux of cars in one dimensionalroad. The priority of occupation at entry site $i_{1}$ (moving at exit site$i_{2}$) is attributed to the particle which entered (absorbed) in the chain.Phase diagrams in ($\beta_{0},\alpha_{0}$), and ($\beta,\alpha_{0}$) plans areestablished. For $\alpha=0.1$, they show three different topologies in the flowbehaviour. The first one correspond to the presence of four regions, by varying$\alpha_{0}$; namely low density phase (LDP), intermediate density phase (IDP),plateau current phase (PCP) and high density phase (HDP). In the secondtopology the interdmediate density phase disappears. The third topologypresents only two regions; i.e. low and high density phases. For small valuesof $\alpha$, the (IDP) and (PCP) disappears, respectively, by increasing$\beta$. When increasing $\alpha$, the forth topology, corresponding to onephase (HDP), appears for low values of $\beta$ and $\beta_{0}$
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