An on-ramp simulation system that can be used to debug and test the Universal Ramp Metering Software (URMS) is presented. The tool includes a simple car following microscopic traffic model for the on-ramp and a Controller Interface Device (CID), which interfaces a standard personal computer with a 2070 traffic controller. The CID consists of the low cost and commonly available National Instrume...

1 This article focuses on cybersecurity of transportation systems and investigates their vulnerability 2 to attacks on the sensing and control infrastructure. An array of different attack points, classi3 fied into physical, close-proximity, and virtual layers, are reviewed and investigated. We construct 4 two benchmark scenarios which exploit these vulnerabilities to identify the potential harm...

This paper presents a model based fault detection and exclusion scheme that implements a decision logic to automatically identify faulty or mislocated freeway traffic sensors in the presence of unknown on-ramp and off-ramp flows. The algorithm is deployed within the framework of a suite of software tools, named TOPl, which models traffic flow via a macroscopic model, calibrates the model based ...

Roadway traffic control is an important practical example of real time control applications, but effective roadway control is hampered by a variety of organizational, financial and technical considerations. One major hurdle is the current reliance on outmoded field hardware and software. A systematic approach to traffic engineering software development could provide significant advantages with ...

In Akamatsu and Heydecker (2003), we presented a necessary and sufficient condition for the occurrence of capacity paradoxes in general saturated networks, in which there is a queue on each link. The present paper extends that analysis to the more usual case of non-saturated networks, in which there are queues on some links but not on others. First we formulate dynamic user equilibrium (DUE) as...

Homogeneous traffic flows are believed to be better in absorbing disturbances, raise capacity and stimulate traffic safety. Measures to make traffic more homogeneous are therefore often taken to increase capacity. This paper shows that the ability of a traffic flow to deal with traffic coming from an on-ramp reduces when the through flow becomes more homogeneous. A motorway was modelled in the ...

In this paper, congestion dynamics along crowded freeway corridors are modeled as a conservation law with a source term that is continuous in space. The source term represents the net inflow from ramps, postulated here as a location-dependent function of the demand for entering and exiting the corridor. Demands are assumed time-independent, which is appropriate for understanding the onset of co...

This paper discusses the application of coalitional model predictive control (MPC) to freeways traffic networks, where goal is reducing time spent by drivers through a dynamic setting variable speed limits (VSL) and ramp metering. The prediction METANET used represent flows evolution. system behavior objective function lead non-convex non-linear optimization problem, which can only be solved in...