Macroscopic Fundamental Diagram (MFD) builds a relationship between the outflow and accumulation of the network in variant of demands and appears frequently in urban transportation networks under certain conditions. However, MFD is not expected if the network is heterogeneous. This paper studies the impact of network spatial characteristics on the existence and characteristics of a MFD based on simulation. Firstly, the paper analysis the network spatial influence factors, including the size and the critical link of the neighborhood that may influence the existence of a MFD and its shape respectively. Then, how this factors influences the property of MFD is explored.
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