00621704

Component

http://onlinepubs.trb.org...trr/1991/1320/1320-029.pdf

https://scholar.google.co...uhne&publication_year=1991

Freeway traffic flow is described in terms of control theory. The detecting elements of millimeter-wave radar sensors, which detect speed and occupancy time by a 61-GHz continuous-wave doppler radar, are used. The regulating unit consists of variable traffic signs for traffic-dependent speed limit and alternative route guidance. The control unit consists of a local computer and a control center. The control strategy is based on a continuum theory of traffic flow, which takes into account characteristics of the speed distribution for different traffic states. For incident detection and early warning criteria, the model yields the traffic density as a crucial stability parameter. For measuring the traffic density, a correlation technique is presented that for dense traffic uses the radar reflection signals as fingerprints for reidentification of vehicles.

This paper appears in Transportation Research Record No. 1320, Freeway Operations, Highway Capacity, and Traffic Flow 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407170

p. 251-259

1991

Transportation Research Record

0309051533

Figures (13) ; Photos (1) ; References (28)

Control; Detection and identification; Detectors; Freeways; Route guidance; Speed limits; Traffic density; Traffic flow; Traffic incidents; Traffic simulation; Variable message signs

Incidents; Vehicle reidentification

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Apr 30 1992 12:00AM

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