The macroscopic fundamental diagram or network fundamental diagram (NFD) describes the relationship between network flow and the number of travelers within a network. The shape of the NFD is important for control purposes such as perimeter control or routing. However, the influence of network structure on NFD shape is unknown. This topic is studied, along with the influence of adding urban arterials (i.e., decreasing homogeneity but adding road capacity) and the effect of arterial location. For this purpose, a tool is developed to create realistic networks with preset characteristics (i.e., road length and road type). The exact network is created at random. Simulation results indicate that networks with similar characteristics have different NFDs. The tool creates networks that have arterials next to urban roads. Simulation results indicate that for these more heterogeneous networks, spread is higher and maximum production is lower in the NFD. The exact location of a major road crossing the network does not have a large effect. Overall, the NFD is network specific and must be calibrated for a particular network.
Influence of Road Layout on Network Fundamental Diagram
Transportation Research Record: Journal of the Transportation Research Board
Transportation Research Record: Journal of the Transportation Research Board ; 2421 , 1 ; 22-30
2014-01-01
Article (Journal)
Electronic Resource
English
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