Freeway Data Collection, Storage, Processing, and Use
نویسنده
چکیده
The paper begins with a brief discussion of issues that must be resolved in building a freeway data management system. Following this is a description of the design choices that dealt with these issues in a functioning system for California freeways. The system is called PeMS. Some concrete uses of PeMS are presented next. These uses imposed the functional requirements that led to the design choices in PeMS. Any freeway data management system will have to meet similar functional requirements.
منابع مشابه
Measuring Traffic
A traffic performance measurement system, PeMS, currently functions as a statewide repository for traffic data gathered by thousands of automatic sensors. It has integrated data collection, processing and communications infrastructure with data storage and analytical tools. In this paper, we discuss statistical issues that have emerged as we attempt to process a data stream of 2 GB per day of w...
متن کاملAn Overview on Platelet-derived Microparticles in Platelet Concentrates: blood collection, method preparation and storage
Preparations of platelet concentrates (PCs) that are stored under blood bank conditions and used for transfusion purposes, appear to be enriched in platelet derived-microparticles (PMPs) with high coagulant activity that may change platelet efficacy and safety issues. High shear stress could cause shedding of PMPs from the platelet plasma membrane, platelet aggregation, and activation of the co...
متن کاملApplication of Aerial Video for Traffic Flow Monitoring and Management
Researchers at the University of Arizona are investigating the potential of remotely sensed data, using aerial video, to enhance existing data sources and therefore to improve traffic management. This research has developed new methods for both data collection and image processing of remotely sensed data. While the use of remotely sensed data to monitor traffic flows is not new, this research i...
متن کاملA Microsimulation Model of a Congested Freeway using VISSIM
A procedure for constructing and calibrating a detailed model of a freeway using VISSIM is presented and applied to a 15-mile stretch of I-210 West in Pasadena, California. This test site provides several challenges for microscopic modeling: an HOV lane with an intermittent barrier, a heavy freeway connector, 20 metered onramps with and without HOV bypass lanes, and three interacting bottleneck...
متن کاملA Travel Time Prediction Algorithm Scalable to Freeway Networks with Many Nodes with Arbitrary Travel Routes
A travel time prediction algorithm scalable to large freeway networks with many nodes with arbitrary travel routes is proposed. Instead of constructing separate predictors for individual routes, it first predicts the whole future space-time field of travel times and then traverses the required subsection of the predicted travel time field to compute the travel time estimate for the requested ro...
متن کامل