Ali Haghani

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Papers by Ali Haghani

A combined model of train routing, makeup, and empty car distribution

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Lower-Bound Solution Algorithm for Equilibrium Signal-Setting Problem

by Kaveh Farokhi, Ali Haghani, and Hedayat Zokaei-Aashtiani

Transportation Research Record, Jan 1, 2008

and then defined a distance function with a max-min technique to solve the problem.

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Data collection of freeway travel time ground truth with bluetooth sensors

by Kaveh Farokhi and Ali Haghani

… Record: Journal of …, Jan 1, 2010

System (5). Meanwhile, efforts have been undertaken to evaluate the quality of various travel tim... more System (5). Meanwhile, efforts have been undertaken to evaluate the quality of various travel time data sources (6-8). For this purpose, many different methods are introduced and currently are in use. Recently, Haghani et al. (6, 7) evaluated real-time speed data from cellphonebased and Global Positioning System (GPS)-based technologies. Kothuri et al. (8) evaluated errors in detector-based real-time travel time estimates in Portland, Oregon. They outlined their solutions for reducing the estimation errors. In all of these studies, probe vehicle runs were used as the source for ground truth.

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Real-Time Solution of Velocity Based First-Order Continuum Traffic Model Using Finite Element Method

by Kaveh Farokhi and Ali Haghani

Transportation Research Board 90th Annual …, Jan 1, 2011

model provides a good approximation of the dynamics of traffic flow that has proved to be useful ... more model provides a good approximation of the dynamics of traffic flow that has proved to be useful for most practical purposes.

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Freeway travel time ground truth data collection using bluetooth sensors

by Kaveh Farokhi and Ali Haghani

… Research Record: Journal …, Jan 1, 2010

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First order velocity based travel time model

by Kaveh Farokhi and Ali Haghani

A general first-order model relating directional derivatives of travel time with speed at each po... more A general first-order model relating directional derivatives of travel time with speed at each point in the time-space domain is used in speed based travel time estimation. Due to its partial differential equation (PDE) form, this model makes it possible to estimate travel times without the need for trajectory construction based on speeds which is a cumbersome integration operation. A forward time backward space (FTBS) finite difference scheme is presented to approximate the general model. While the general model and its corresponding FTBS solution scheme are designed for smooth situations, the traffic stream is replete with discontinuities especially as congestion increases. For these situations an equivalent conservative model based on the first order continuum traffic flow model with Greenshields flux is proposed. A Godunov scheme is proposed to approximate the conservative model. US-101 dataset from NGSIM project is used to illustrate the performance of the proposed models. Three factors impacting the performance of the proposed schemes that is underlying speed estimate accuracy, traffic congestion level and discretization level are considered.

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Aggregation Effects on the Network Design Problem

by Ali Haghani and Mark S Daskin

Journal of Advanced …, Jan 1, 1986

Page 1. Aggregation Effects on the Network Design Problem Ali E. Haghani Mark S. Daskin This arti... more Page 1. Aggregation Effects on the Network Design Problem Ali E. Haghani Mark S. Daskin This article examines the effects of various network extraction schemes on the network design problem. Given an original network, many ...

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Ali Haghani

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