NOTE: This item is not available outside the Texas A&M University network. Texas A&M affiliated users who are off campus can access the item through NetID and password authentication or by using TAMU VPN. Non-affiliated individuals should request a copy through their local library's interlibrary loan service.
Coordinating diamond interchange and arterial street signal control
Abstract
In urban areas, diamond interchanges are often located on arterial streets. There are significant functional differences between diamond interchanges and arterial streets, as arterial streets serve mainly through traffic, while diamond interchanges serve mainly turning traffic. Due to these functional differences, special attention should be given to the traffic signal control. The objective of this thesis was to formulate and evaluate a strategy for integrating diamond interchange signal control and arterial street signal control. Specifically, the study attempted. to determine the conditions under which it would be beneficial to coordinate diamond interchange and arterial signal control. An approach for evaluating uncoordinated and coordinated interchange-arterial control was developed. The approach entails dividing the arterial-interchange system into three components, (i) the arterial, (ii) the interchange, and (iii) the arterial. interchange interface. The benefits of coordinated control on each of these components can be estimated by applying methodologies and heuristics developed in this thesis. The estimated performance of the three components under coordinated control must are then aggregated to estimate of the performance of the combined system under coordination. The combined performance estimate may be compared to the performance under uncoordinated control, to determine the benefits of coordination, if any. Separate strategies for coordinating diamond interchange and arterial signal control were developed for undersaturated and oversaturated conditions on the arterial and interchange. The strategy for undersaturated conditions was then tested on a hypothetical arterial-interchange system using microscopic simulation. Results indicated that the methodologies and guideline to estimate performance changes when changing from uncoordinated to coordinated control, but ideally, mesoscopic or microscopic simulate' ion should be used to accurately quantify delay differences. Nevertheless, the study indicated that under some conditions, notably particular cycle lengths, the coordination of diamond interchange and arterial signal control could be beneficial. This will be the case when the optimal cycle lengths of the arterial and interchange systems are similar-probably not differing by more than 10 to 15 seconds-and when the spacing between the interchange and the closest arterial signal is I conducive to good progression across the arterial-interchange interface.
Description
Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.Includes bibliographical references: p. 143-149.
Issued also on microfiche from Lange Micrographics.
Collections
Citation
Engelbrecht, Roelof Johannes (1997). Coordinating diamond interchange and arterial street signal control. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1997 -THESIS -E534.
Request Open Access
This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.