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The paper characterizes the behavior of the cell transmission model of a freeway, divided into N sections or cells, each with one on-ramp and one off-ramp. The state of the dynamical system is the N-dimensional vector n of vehicle densities in the N sections. A feasible stationary demand pattern induces a unique equilibrium flow in each section. However,… (More)

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… (More)

We present a method for automated, empirical calibration of freeway traffic flow characteristics. The method uses 5-min flow and density values for a section of freeway and rapidly and reliably estimates key parameters such as free flow speed, capacity, critical density, congestion wave speed and jam density, which are key inputs to many macroscopic traffic… (More)

- A. Chow, V. Dadok, +9 authors P. Varaiya
- 2008

TOPL is a suite of software tools for specifying freeway operational improvement strategies, such as ramp metering, demand and incident management, and for quickly estimating the benefits of such improvements. TOPL is based on the macroscopic cell transmission model. The paper summarizes the theory of the cell transmission model and describes the procedure… (More)

214 words in abstract + 4450 words in text + 8 figures + 1 table with 34 references ⇒ Total word count: 6936 / 7000 ABSTRACT While the Cell Transmission Model (CTM) is generally accepted as a standard representation of traffic flows on freeways with long links and uninterrupted flows, less is known about the accuracy of CTM or other macroscopic queueing… (More)

- G. Gomes, R. Horowitz
- Proceedings. The 7th International IEEE…
- 2004

A mathematical programming approach to the freeway on-ramp metering problem is formulated. The objective function is a linear combination of mainline and on-ramp flows, termed the generalized total travel time. The underlying freeway model - the asymmetric cell transmission model (ACTM) - is similar to the original cell transmission model (CTM), except that… (More)

- Gabriel Gomes
- 2003

A procedure for constructing and calibrating a detailed model of a freeway using VISSIM is presented and applied to a 15-mile stretch of I-210 West in Pasadena, California. This test site provides several challenges for microscopic modeling: an HOV lane with an intermittent barrier, a heavy freeway connector, 20 metered onramps with and without HOV bypass… (More)

- ZuWhan Kim, Gabriel Gomes, Robert Hranac, Alexander Skabardonis
- 2005

An advanced machine vision system is presented that automatically extracts vehicle trajectories over long freeway sections from video data. For each vehicle, its dimension and initial position are robustly given by the vehicle detection algorithm, and a separate tracking algorithm is used to extract the vehicle's trajectory from the images of multiple… (More)

- Gabriel Gomes
- IEEE Transactions on Intelligent Transportation…
- 2015

We revisit the offset optimization problem for maximization of two-way progression bands. A new formulation is proposed relying on the concepts of relative offset and vehicle arrival functions. Vehicle arrival functions represent the probability that a vehicle reaches a given intersection at a given time. Relative offsets are the displacement of the arrival… (More)

- Alessandra Pascale, Gabriel Gomes, Monica Nicoli
- 2013 IEEE International Conference on Acoustics…
- 2013

Traffic control is essential for the achievement of a sustainable and safe mobility. Monitoring systems deployed over the roads collect a great amount of traffic data that must be efficiently processed by statistical methods to draw traffic macroparameters that are needed for control operations. In this paper we propose a particle filtering approach to… (More)