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- W581208022 abstract "In the Netherlands a system exists for monitoring motorway usage. This is done by storing a link flow profile (represented by 24 one hour averages) for each weekday (Sunday, Monday, etc.). Link flow profiles are used for purposes such as planning road maintenance and identifying potential future bottlenecks. For part of the network, link flows can be directly observed. The objective is to estimate the unobserved link flows, using not only observed flows but also additional information such as a base-year origin-destination (OD) matrix and assumptions on spatial dependencies of network flows. A first method considered for this purpose is to update a prior matrix from available traffic counts using generalised least squares and assigning the updated matrix to the network. This will yield estimates for both the observed and the unobserved link flows. A base year matrix partitioned over the hours of the day in an appropriate way may serve as the prior matrix. This method has the major drawback that much emphasis is put on the prior matrix, while this matrix is quite unreliable for the purpose as in general it will not be representative for a specific hour and type of day. As a remedy a second method is considered in which the missing link volumes are expressed as weighted sums of observed volumes on nearby links. The weights are computed such that the expected error of estimation is minimised. For the covering abstract, see IRRD E101013." @default.
- W581208022 created "2016-06-24" @default.
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- W581208022 date "1997-09-01" @default.
- W581208022 modified "2023-09-26" @default.
- W581208022 title "ESTIMATING MISSING LINK VOLUMES IN A TRAFFIC NETWORK" @default.
- W581208022 hasPublicationYear "1997" @default.
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