Motorway network thraffic control systems

good

This paper reviews the methods used for the design of motorway network traffic control strategies. Various control strategies for the available control measures are discussed in terms of their design and their operating features, including ramp metering, route guidance, and link control. An example of an advanced coordinated ramp metering control strategy which is based on large-scale optimisation and is applied to the Amsterdam ring-road is presented.

good

du1wen

谢谢了，可以仔细看看！！！！！！！

zhxo

读了好几遍了

小妖

Real-time freeway traffic state estimation based on extended Kalman filter: a general approach
Yibing Wang *, Markos Papageorgiou
Dynamic Systems and Simulation Laboratory, Technical University of Crete, 73100 Chania, Greece
Received 18 November 2002; received in revised form 25 February 2003; accepted 1 March 2004
Available online
Abstract
A general approach to the real-time estimation of the complete traffic state in freeway stretches is
developed based on the extended Kalman filter. First, a general stochastic macroscopic traffic flow model of
freeway stretches is presented, while some simple formulae are proposed to model real-time traffic measurements.
Second, the macroscopic traffic flow model along with the measurement model is organized in a
compact state-space form, based on which a traffic state estimator is designed by use of the extended-
Kalman-filtering method. While constructing the traffic state estimator, special attention is paid to the
handling of the boundary conditions and unknown parameters of the macroscopic traffic flow model. A
number of simulations are conducted to test the designed traffic state estimator under various traffic situations
in a freeway stretch with on/off-ramps and a long inter-detector distance. Some key issues are
carefully investigated, including tracking capability of the traffic state estimator, comparison of various
estimation schemes, evaluation of different detector configurations, significance of the on-line model
parameter estimation, sensitivity of the traffic state estimator to the initial values of the estimated model
parameters and to the related standard deviation values, and dynamic tracking of time-varying model
parameters. The achieved simulation results are very promising for the subsequent development and testing
work that is briefly outlined.

2004 Elsevier Ltd. All rights reserved.
Keywords: Freeway; Traffic state estimation; Stochastic macroscopic traffic flow model; Extended Kalman filter; Model
parameter estimation

good

请zhxo 谈谈读后的感受。