Development of Next Generation Intersection Control
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2013-03-01
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TRIS Online Accession Number:01489534
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Edition:Final Report t [11/1/2010 - 3/31/2013]
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NTL Classification:NTL-INTELLIGENT TRANSPORTATION SYSTEMS-INTELLIGENT TRANSPORTATION SYSTEMS;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;
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Abstract:A reservation-based autonomous intersection control system, named Autonomous Control of Urban TrAffic (ACUTA), was developed as a part of this research effort. ACUTA allows centralized management of autonomous vehicles within a certain distance from an intersection to allow vehicles to pass the intersection with fewer stops and no conflicts. To address the operational issues of reservation-based autonomous intersection management identified in previous studies, three operational enhancement strategies are introduced and incorporated into ACUTA. The three strategies were evaluated and shown to be effective in reducing intersection delay. Along with the operational improvements offered by ACUTA, its implementation in VISSIM, a standard simulation platform is a significant achievement. By using a widely applied standard simulation platform, measures of effectiveness for different autonomous control algorithms can be standardized, and simulation results can be more reliable. Most importantly, results from different studies, particularly for operational performance, can be compared to each Tech Report through standardization of the simulation platform. In addition, various simulation experiments were conducted to evaluate operational performance of both multi-tile ACUTA and single-tile ACUTA. Results show that multi-tile ACUTA has significant operational superiority over optimized signal control, especially under high traffic demand conditions, while single-tile ACUTA shows promise in replacing four-way stop control for efficient management of autonomous vehicles at low volume intersections. Evaluation results also indicate that ACUTA system has successfully resolved both minor-road starvation issue under unbalanced demand conditions and slow-speed reservation issue identified in previous studies. To optimize ACUTA system’s operational performance, sensitivity analyses were conducted on ACUTA’s configurable parameters, identifying parameters that intersection delay is sensitive to, along with their trend in impacting intersection delay. Finally, ACUTA’s capability of accommodating heavy trucks was also evaluated. Results show that ACUTA can efficiently accommodate high demands of heavy trucks with short delays.
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