This study proposes a design and evaluation method of lane change guidance system for freeway incident management. Microscopic simulator VISSIM is used to facilitate the design and evaluation. ...Sixteen incident scenarios are used with four varying factors: demanding flow, incident duration, incident location and driver compliance rate. The average number of stops per vehicle and the average speed from one-hour simulation runs are recorded as performance measures to evaluate the effectiveness of the lane change guidance system. The results show that the lane change guidance system has positive impact on the environment and safety for certain traffic conditions.
S3T (Stochastic Structural Stability Theory) employs a closure at second order to obtain the dynamics of the statistical mean turbulent state. When S3T is implemented as a coupled set of equations ...for the streamwise mean and perturbation states, nonlinearity in the dynamics is restricted to interaction between the mean and perturbations. The S3T statistical mean state dynamics can be approximately implemented by similarly restricting the dynamics used in a direct numerical simulation (DNS) of the full Navier-Stokes equations (referred to as the NS system). Although this restricted nonlinear system (referred to as the RNL system) is greatly simplified in its dynamics in comparison to the associated NS, it nevertheless self-sustains a turbulent state in wall-bounded shear flow with structures and dynamics comparable to that in observed turbulence. Moreover, RNL turbulence can be analyzed effectively using theoretical methods developed to study the closely related S3T system. In order to better understand RNL turbulence and its relation to NS turbulence, an extensive comparison is made of diagnostics of structure and dynamics in these systems. Although quantitative differences are found, the results show that turbulence in the RNL system closely parallels that in NS and suggest that the S3T/RNL system provides a promising reduced complexity model for studying turbulence in wall-bounded shear flows.
The number of private vehicles increased dramatically during the last two decades in the island of Cyprus. This phenomenon had a negative effect on the bus transport mode which over the years its use ...has been considerably reduced. As traffic congestion increased considerably during the same period the need for a high quality public transportation system became clear. This need is also supported by the demand for public transportation by the aging and disadvantaged population. The best way to attract people back to public transportation is to have a reliable bus system with a high quality of service which can compensate for the lack of freedom and exibility a private vehicle can provide. However such a system should not have a negative effect on the traffic network in terms of congestion and travel times but should coexist serving both the needs of people who do not drive and those who use the public transport mode.
The purpose of this paper is to present the development and evaluation of a number of scenarios aiming at attracting commuters back to public transportation. This idea stems from the fact that surveys among the Cypriot commuters show that people will use buses if buses provide a fast and reliable service. For this purpose, microscopic simulation models are developed in order to examine several scenarios of dedicated bus lanes and bus priority schemes so that the buses can provide the desired level of service with the minimal impact on the rest of the traffic.
We show that an adaptive input/output feedback linearization control scheme for minimum phase non‐ linear systems is robust with respect to unstructured plant uncertainties such as unmodelled ...dynamics and disturbances provided that the adaptive law is modified in the same fashion as for linear systems and the plant non‐linearities satisfy some growth c onstraints. In the analysis we utilize weighted ℒ︁2‐norms analogously to the case with a linear model.
Several continuous-time and discrete-time recurrent neural network models have been developed and applied to various engineering problems. One of the difficulties encountered in the application of ...recurrent networks is the derivation of efficient learning algorithms that also guarantee the stability of the overall system. This paper studies the approximation and learning properties of one class of recurrent networks, known as high-order neural networks; and applies these architectures to the identification of dynamical systems. In recurrent high-order neural networks, the dynamic components are distributed throughout the network in the form of dynamic neurons. It is shown that if enough high-order connections are allowed then this network is capable of approximating arbitrary dynamical systems. Identification schemes based on high-order network architectures are designed and analyzed.< >
This is the final report for the project entitled \Evaluation and Analysis of Automated Highway System Concepts and Architectures" in response to the contractual requirements of the Memorandum of ...Understanding MOU# 235, between the Partners of Advanced Transit and Highways (PATH) and the University of Southern California, administered at the University of Califor- nia at Berkeley. The purpose of this project was to select, evaluate and analyze a num- ber of promising Automated Highway System (AHS) operational concepts based on previous work. The evaluation and analysis includes headway dis- tributions for vehicle following and lane changing, capacity calculations and the modeling, analysis and control of the resulting traffic flow. The design, analysis and simulation parts of the project were performed at the Center of Advanced Transportation Technologies at the University of Southern Cali- fornia. The work performed under this project is presented in the form of five reports presented in part I, II, III, IV, and V of this final report. In addition to these reports oppy disks containing the \Inter Vehicle Spacing Software Tool" is included. Keywords: Automated Highway Systems, Vehicle Following, Vehicle Spac- ing, Highway Capacity, Highway Safety, Accident Avoidance, Collision Avoid- ance, Braking Scenarios, Brake Performance, Lane Changing, Merging, Macro- scopic Models, Tra c Flow, Hybrid Systems, Roadway Controller.
Automatic vehicle following is an important feature of a fully or partially automated highway system (AHS). The on-board vehicle control system should be able to accept and process inputs from the ...driver, the infrastructure and other vehicles, perform diag- nostics and provide the appropriate commands to actuators so that the resulting motion of the vehicle is safe and compatible with the AHS objectives. The purpose of this paper is to design and test a vehicle control system in order to achieve full vehicle automation in the longitudinal direction for several modes of operation, where the infrastructure manages the vehicle following. These modes include autonomous vehicles, cooperative vehicle following and platooning. The vehicle control system consists of a supervisory controller that processes the inputs from the driver, the infrastructure, other vehicles and the on-board sensors and sends the appropriate commands to the brake and throttle controllers. In addition, the controller makes decisions about normal, emergency and transition operations. Simulation results of some of the basic vehicle following maneu- vers are used to verify the claimed performance of the designed controllers. Experiments on I-15 that demonstrate the performance of the throttle controller with and without vehicle-to-vehicle communications in an actual highway environment are also included. Keywords: Vehicle Control, Automated Highway Systems, Automatic Vehicle Following, Supervisory Control.
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