Creation of a new link or increase in capacity of an existing link can reduce the efficiency of a congested network as measured by the total travel cost. This phenomenon, of which an extreme example is given by Braess’s paradox, has been examined in conventional studies within the framework of static assignment. For dynamic traffic assignment, which makes account of the effect of congestion thr...

Abstract-We propose a new mathematical formulation for the problem of optimal traffic assignment in dynamic networks with multiple origins and destinations. This problem is motivated by route guidance issues that arise in an Intelligent Vehicle-Highway Systems (IVHS) environment. We assume that the network is subject to known time-varying demands for travel between its origins and destinations ...

The contents of this report reflect the views of the authors who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the State of California. This report does not constitute a standard, specification, or regulation. Under this task order, the California ATMS testbed hosted two full-time PATH resea...

Recent natural or man-made disasters around the world have provided compelling evidence that transportation system plays a crucial role in the emergency evacuation and have stressed the need for effective evacuation traffic management to maximize the utilization of the transportation system and to minimize fatalities and losses. This paper presents a model reference adaptive control (MRAC) fram...

Dynamic Traffic Assignment is currently a key topic for the most advanced traffic management systems. Basically, it consists on automatically diverting traffic to the optimal choice of a set of alternatives – or combination of alternatives – towards each vehicle‟s destination node. A truly dynamic traffic assignment system could, potentially, cope with a highly variable traffic user demand and ...

In managing a traffic network, it is desirable in some case to control the traffic such that the traffic volume on a certain link does not exceed a predefined threshold (e.g. its capacity). One method is to introduce physical capacity constraints for those links. Another method is to use an asymptotic travel time function that forces the travel time of the link to approach infinity when the flo...