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Time-varying origin-destination (OD) demands are the essential elements in the modeling and evaluation of urban traffic planning and traffic management and control strategies. However, most of existing methodologies in estimating time-varying OD demands are not able to be applied for real-world networks. This paper intends to develop a practical approach to estimate time-varying OD demands incorporating...
In response to the increased traffic congestion and worsened air pollution, using the portable emission measurement system (PEMS), this paper collects and compares the real world emissions under signal coordination and non-coordination in Beijing, and analyzes the emission levels and distribution characteristics under these two control strategies. Furthermore, by integrating the microscopic traffic...
As the main venue of the 2008 Beijing Olympic Games, the National Stadium hosted the opening and closing ceremonies, field and track events, and final football games. This paper intends to study the problems associated with vehicle evacuation from the parking lot, and develop evacuation plans. First, the paper analyzes the particular conditions of the parking lot in the National Stadium, as well as...
Traffic incidents are major contributors to traffic delay. Expedient and reliable incident detection is an important part of expressway traffic management and control in urban areas. This paper proposes an automated incident detection algorithm for urban expressways based on probe vehicle data by the CUSUM algorithm based approach. The presented algorithm is validated using the actual incident information...
This paper addresses a modeling approach to analyzing an integrated system that includes freeway mainlines, ramp metering, and an upstream signalized diamond interchange. The modeling approach takes into consideration of the various components, their operational characteristics, and their interactions within the system. Strategies are also proposed for real-time operation and possible field implementation...
Through a characteristic analysis of multi-source Intelligent Transportation System (ITS) data fusion on data layer combined with the concept of support vector machine (SVM), this article proposes a multi-source ITS data fusion technique using SVM, and designs a corresponding implementation approach from perspectives of SVM training, training result evaluation and SVM test. A comparison of data outputs...
Many studies have shown that the quality of vehicle emissions is typically affected by vehicles' instantaneous speeds and acceleration rates. In order to develop effective strategies for vehicle emission controls, it is necessary to develop a microscopic simulation platform for estimating vehicle emissions that can capture the vehicles' instantaneous modal activities. This article is intended to develop...
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