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- W577346642 abstract "In the calibration of transportation planning models, adjustments to link speeds or impedances are very common. However, since this process is typically conducted on an ad hoc basis to fix localized problems, the adjustments invariably create new problems in other parts of the network. Consequently, the network calibration often turns into a painstaking, protracted process of trial-and-error adjustments. In this paper, a simple two-step procedure for simultaneously adjusting link speeds throughout the network is presented. The paper presents a case study using the Terre Haute, Indiana network, and the results of a more recent application of the technique in calibrating the South Bend-Elkhart, Indiana network. Before-and-after error statistics are discussed as well as summary statistics of speeds by facility type and corridor. The method has proven to be a tremendous time-saver and can be very useful for modelers provided it is not used as a panacea for calibration problems that are not related to link speed misspecifications. The paper ends by taking pains to point out this potential for abuse. For modelers who prefer to avoid individual link impedance adjustments in favor of modifying speed-capacity tables, the procedure can be used for determining the optimum average speed for a given facility type." @default.
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- W577346642 date "1993-09-01" @default.
- W577346642 modified "2023-09-27" @default.
- W577346642 title "A SIMULTANEOUS LINK SPEED ADJUSTMENT PROCEDURE FOR CALIBRATING TRAFFIC ASSIGNMENT MODELS: A CASE STUDY OF TERRE HAUTE & SOUTH BEND" @default.
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