Development of a robust Arterial Signal Coordination Software /
Development of a robust Arterial Signal Coordination software (ASCS) is described in this dissertation. ASCS is capable of coordinating signals in both undersaturated and oversaturated conditions. The software consists of three modules: (1) the input module consisting of a user interface; (2) the...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2001.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=726103031&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Development of a robust Arterial Signal Coordination software (ASCS) is described in this dissertation. ASCS is capable of coordinating signals in both undersaturated and oversaturated conditions. The software consists of three modules: (1) the input module consisting of a user interface; (2) the optimization module consisting of a genetic algorithm (GA) based optimizer; and (3) a traffic analysis module that serves as the fitness function for the GA-based optimizer. The analysis module consists of two different routines: (1) a bandwidth analysis routine, and (2) a delay analysis routine. The delay analysis routine is a mesoscopic simulation model that applies shock wave theory to explicitly consider queue spillback and optimize signal timings during oversaturated traffic conditions. Both the analysis routines are thoroughly validated against existing software. The GA-based optimization routine can apply either the delay analysis routine (GA-DAR) or the bandwidth analysis routine (GA-BAR) as its fitness calculation routine. The choice is user selected in the ASCS input. Guidelines for selecting GA parameters are developed by performing extensive sensitivity analysis. CORSIM is used as the unbiased estimator for comparing ASCS with existing software. Comparisons of GA-DAR against PASSER III for optimizing diamond interchanges timings show that GA-DAR provided significantly better results than PASSER III when congestion occurs on internal links. Four ASCS strategies: (1) delay optimization with delay-minimized splits (DD), (2) delay optimization with Webster splits (DW), (3) bandwidth optimization with delay-minimized splits (BD), and (4) bandwidth optimization with Webster splits (BW) are compared with well established software (PASSER II, Synchro and TRANSYT-7F) for five different signalized arterials with varying traffic volume and geometric conditions. The results indicate that the ASCS strategies perform quite well for almost all the cases. The progression efficiency produced by BD and BW are comparable to PASSER II. Synchro and the strategy DD consistently produce lower delays and higher throughputs for most conditions, while TRANSYT-7F consistently performs worse than the other strategies. |
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| Item Description: | Vita. "Major Subject: Civil Engineering". |
| Physical Description: | xvi, 183 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 151-160). |