Title: THE ROADWAY ASSIGNMENT COMPARISON PROGRAM, RDSTRC
Abstract: It is sometimes necessary for the transportation planner to assess the implication of a in tree building assumptions within the modelling process e.g. the effect of building trees on the basis of time rather than distance. How stable is a particular assignment under these circumstances? Other factors such as a in the time needed to traverse a length of road may also be involved. The assessment of the influence of such changes is currently often the result of arduous manual techniques or somewhat limited computer applications. A problem applying to both of these approaches concerns the need to completely examine the model output in fine detail before it is possible to determine whether or not major changes have been induced. This paper presents a test case involving sample output from the run of program RDSTRC. RDSTRC will perform an assignment comparison on two roadway loaded networks and produce user controlled diagnostics aimed at assisting the user to readily identify not only the degree but also the location of changing journey patterns from one assignment to another. It has been designed to avoid the unnecessary use of computer time by means of the provision of user controlled progressive levels of detail. Thus an overall impression of assignment stability may be obtained prior to producing full comparison printouts which could prove redundant if there were negligible or even massive variation. The paper demonstrates how an alteration of the trees indicates initially a significant in the assignment leading to further examination via the subsequent options. This increased detail includes tables and histograms summarizing the major features and reference is made to the change matrix. This matrix may be output from the program and contains trip information relating only to journeys which route between assignments. The possibilities for further use of this matrix is demonstrated. (Author/TRRL)
Publication Year: 1983
Publication Date: 1983-01-01
Language: en
Type: article
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