RHODES-ITMS-MILOS : ramp metering system test
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2002-04-01
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Abstract:The RHODES-Integrated Traffic Management System Program addresses the design and development of a real-time traffic adaptive control system for an integrated system of freeways and arterial roads. The goals of this project were to test coordinated, adaptive ramp metering using the Multi-Objective, Integrated, Large-Scale, and Optimized System (MILOS) software on a major urban freeway. A 7-mile eastbound segment of I-10 in Phoenix, just west of the I-10/I-17 interchange, was chosen as the study area because of the availability of data, and because of recurring congestion. The field test was to be accomplished in three phases: (i) testing the hierarchical MILOS control software via simulation, (ii) development of interfaces necessary to use MILOS in the field, and (iii) testing the effectiveness of MILOS in real time. The project accomplished the first of these objectives, developing a simulation model of the I-10 freeway and showing through experiments that coordinated adaptive ramp metering is more effective than no-control or traffic responsive metering. In developing the freeway model, the project further refined the processes needed to calibrate and test MILOS for a specific freeway. The second objective was only partially met. The interfaces within MILOS have been refined, but only some of the interfaces with the real-time data have been established. The interface for data flowing from the freeway management system into MILOS has been established. An interface for delivering ramp-metering rates from MILOS to the field via the freeway management system has not been established. The development of this second interface via a subcontract was determined to be infeasible within the project budget. Because of this, the third objective has not yet been achieved. The effectiveness of MILOS and coordinated ramp metering in the field will not be proven until this third objective can be achieved.
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