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Metering mode

About: Metering mode is a research topic. Over the lifetime, 7824 publications have been published within this topic receiving 37480 citations.


Papers
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Journal ArticleDOI
TL;DR: Why ramp metering can lead to a dramatic amelioration of traffic conditions on freeways and an overview of ramps metering algorithms, ranging from early fixed-time approaches to traffic-responsive regulators and to modern sophisticated nonlinear optimal control schemes are provided.
Abstract: Recurrent and nonrecurrent congestion on freeways may be alleviated if today's "spontaneous" infrastructure utilization is replaced by an orderly, controllable operation via comprehensive application of ramp metering and freeway-to-freeway control, combined with powerful optimal control techniques. This paper first explains why ramp metering can lead to a dramatic amelioration of traffic conditions on freeways. An overview of ramp metering algorithms is provided next, ranging from early fixed-time approaches to traffic-responsive regulators and to modern sophisticated nonlinear optimal control schemes. Finally, a large-scale example demonstrates the high potential of advanced ramp metering approaches.

659 citations

Journal ArticleDOI
TL;DR: In this paper, the optimal coordination of variable speed limits and ramp metering in a freeway traffic network is discussed, where the objective of the control is to minimize the total time that vehicles spend in the network.
Abstract: This paper discusses the optimal coordination of variable speed limits and ramp metering in a freeway traffic network, where the objective of the control is to minimize the total time that vehicles spend in the network. Coordinated freeway traffic control is a new development where the control problem is to find the combination of control measures that results in the best network performance. This problem is solved by model predictive control, where the macroscopic traffic flow model METANET is used as the prediction model. We extend this model with a model for dynamic speed limits and for main-stream origins. This approach results in a predictive coordinated control approach where variable speed limits can prevent a traffic breakdown and maintain a higher outflow even when ramp metering is unable to prevent congestion (e.g., because of an on-ramp queue constraint). The use of dynamic speed limits significantly reduces congestion and results in a lower total time spent. Since the primary effect of the speed limits is the limitation of the main-stream flow, a comparison is made with the case where the speed limits are replaced by main-stream metering. The resulting performances are comparable. Since the range of flows that main-stream metering and dynamic speed limits can control is different, the choice between the two should be primarily based on the traffic demands.

581 citations

Patent
Rick Dedrick1
09 Jan 1998
TL;DR: In this paper, the authors describe a computer network system that contains a metering mechanism which can meter the flow of electronic information to a client computer within a network, and charge the price of the information to an electronic account of the end user stored in a database of the metering server.
Abstract: A computer network system that contains a metering mechanism which can meter the flow of electronic information to a client computer within a network. The information can be generated by a publisher and electronically distributed to a plurality of metering servers which each contain the metering mechanism. The metering servers each reside in a local area network that contains a number of client computers. The client computers each contain a graphical user interface that allows an end user to request consumption of the information. The metering mechanisms control the transfer of information into the client computers. Each unit of information has an associated cost type and cost value that are used to calculate a price for the information. When the end user request consumption of information, the metering mechanism determines whether the end user can consume the information. If the end user can access the information, the meter will transfer the information to the end user and charge the price of the information to an electronic account of the end user stored in a database of the metering server. The metering mechanism can periodically transfer the balance of the account, and the charges associated with the account to a billing database that resides in a regional server which automatically generates a bill for the end user.

440 citations

Journal ArticleDOI
TL;DR: It is shown that a near-global solution to the resulting nonlinear optimization problem can be found by solving a single linear program, whenever certain conditions are met.
Abstract: The onramp metering control problem is posed using a cell transmission-like model called the asymmetric cell transmission model (ACTM). The problem formulation captures both freeflow and congested conditions, and includes upper bounds on the metering rates and on the onramp queue lengths. It is shown that a near-global solution to the resulting nonlinear optimization problem can be found by solving a single linear program, whenever certain conditions are met. The most restrictive of these conditions requires the congestion on the mainline not to back up onto the onramps whenever optimal metering is used. The technique is tested numerically using data from a severely congested stretch of freeway in southern California. Simulation results predict a 17.3% reduction in delay when queue constraints are enforced.

371 citations

Patent
11 Jul 1996
TL;DR: A wireless remote telemetry system which uses low-cost remote communication devices operating on existing wireless communication systems in order to provide real-time reading and control of remote devices is described in this article.
Abstract: A wireless remote telemetry system which uses low-cost remote communication devices operating on existing wireless communication systems in order to provide real-time reading and control of remote devices. In an embodiment applicable to utility service, consumption of electrical power among a population of customers is measured by a utility metering system having a wireless communication capability. The metering system comprises a remote metering unit which communicates with a central controller over existing wireless communication systems, such as cellular base stations, using existing communication standards. The remote metering unit transmits various messages over a shared random access channel to a central controller. The central controller transmits messages to the remote metering unit over a paging channel. The remote metering unit may operate in a half-duplex mode only. Furthermore, the remote metering unit may provide a gateway to advanced consumer services at the remote location.

333 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023276
2022647
2021101
2020299
2019410
2018422