An automated highway system link layer controller for traffic flow stabilization

Perry Y. Li, Roberto Horowitz, Luis Alvarez, Jonathan Frankel, Anne M. Robertson

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Controls for the link layer in the Automated Highway System (AHS) hierarchy proposed in the Partners for Advanced Transit and Highways (PATH) are developed. The link layer is modeled using vehicle conservation flow models. Desired traffic conditions on the highway are given by a pair of density and velocity profiles which are assumed to be consistent with the demand on, and the capability of, the highway system. The link layer control laws presented in this paper then stabilize the actual traffic condition to the desired values. Control laws are derived for three highway topologies: a single lane highway, a highway with multiple discrete lanes and a two-dimensional highway with an arbitrary flow pattern. The control laws obtained for each of the topologies is distributed and are suited for implementation in the lower levels of the AHS control hierarchy. Simulation results are also presented.

Original languageEnglish (US)
Pages (from-to)11-37
Number of pages27
JournalTransportation Research Part C: Emerging Technologies
Issue number1
StatePublished - Feb 1997

Bibliographical note

Funding Information:
’ Research supported by UCB-ITS PATH grant MOU-135. *Author for correspondence. +Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, U.S.A. tcurrently at Applied Materials, 350 Bowers Avenue, Santa Clara, California, U.S.A. %urrently at Department of Mechanical Engineering, University of Pittsburgh, U.S.A.


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