00153154

Component

http://onlinepubs.trb.org...s/trr/1976/601/601-004.pdf

http://scholar.google.com...Ross&publication_year=1976

Freeway surveillance and control systems obtain most of their input information from discrete vehicle presence sensors. Performance measures, for both on-line control and off-line evaluation, must be determined from the presence data. The most significant measures include speed, flow rate, and detector occupancy. To obtain accurate estimates of the measures requires that several parameters be established for the sensor configuration and for the computational algorithms. These include size of detection zone, detector scanning interval, vehicle lengths, speed distribution characteristics, averaging period, and degree of feedback of the average speed into the calculation of individual speeds. The relationship between these parameters is complex and does not lend itself to a simple analytical treatment. Therefore, a simulation model was developed to analyze the effect of the various parameters on the accuracy of the measurements obtained from discrete sensors. Through the simulation model, several relationships were investigated. Based on these relationships, some important conclusions and recommendations are offered for the design and operation of discrete sensor systems for freeway surveillance. /Author/

Publication of this paper sponsored by Committee on Freeway Operations. 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.

01411456

Barker, John L; Reiss, Robert; Treiterer, Joseph

pp 19-28

1976

Transportation Research Record

0309025702

Digital/other

Figures (14) ; References (3) ; Tables (1)

Freeways; Mathematical models; Motor vehicles; Sensors; Speed; Traffic control; Traffic flow; Traffic simulation; Traffic speed; Traffic surveillance

Highways; Operations and Traffic Management

TRIS, TRB

May 31 1977 12:00AM

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• HIGHWAY ACCIDENTS AT BRIDGES (ABRIDGMENT)
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• ROADSIDE ENCROACHMENT PARAMETERS FOR NONFREEWAY FACILITIES (ABRIDGMENT)
• ROADSIDE HAZARDS ON NONFREEWAY FACILITIES (ABRIDGMENT)
• SINGLE POINT DIVERSION OF FREEWAY TRAFFIC
• URBAN FREEWAY CORRIDOR CONTROL MODEL (ABRIDGMENT)