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- W2335992835 abstract "The Macroscopic Fundamental Diagram (MFD) is a graphical method used to characterize a traffic state in a road network. In practice, it is still rather difficult to determine an MFD. Both traffic volumes and traffic densities are needed. Loop detectors and probe vehicles can provide the necessary input data. For the determination of the MFD also the proportion probe vehicles has to be known. On the ground are some practical problems: e.g. not all loop detectors work well enough to provide reliable traffic counts; and the proportion of probe vehicles (taxis) in the total flow of vehicles is not uniform in space and time because taxi drivers are inclined to avoid congested routes. The authors derived and analyzed the MFD for an urban area using data collected from taxis with GPS and traffic volumes measured by loop detectors. These data helped to determine the proportion of taxis in the traffic flows as a function of time and location. The changes of the taxi proportion during one day appear to be statistically significant. The proportion appears to be lower on a congested road or at peak hours than on a road with free flow conditions or at off peak hours. MFD diagrams could be drawn for an area covered by reliably working loop detectors. There is some evidence that the MFD is rather stable in one year on days with the same weather conditions but changes significantly in times of rainy, cold weather. An MFD diagram could also be drawn for an area with incomplete data, using only the data gained from a sample of the loop detectors. This MFD has similar characteristics as the one with complete data. This makes it possible to use the MFD for real traffic situations even when traffic data are missing or imperfect." @default.
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- W2335992835 date "2016-01-01" @default.
- W2335992835 modified "2023-09-23" @default.
- W2335992835 title "Determining the Macroscopic Fundamental Diagram on the Basis of Mixed and Incomplete Traffic Data" @default.
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