Aid to Determining Freeway Metering Rates and Detecting Loop Errors
Publication: Journal of Transportation Engineering
Volume 123, Issue 6
Abstract
A recent freeway congestion prediction study for the Washington Department of Transportation (WSDOT) found that the sum of storage rates over time, SumSR(t), for a freeway section was a better variable for determining the best upstream ramp metering rates than the storage rate for time interval t, SR(t), which is the current WSDOT criterion. (Use of the SumSR(t) variable for this purpose requires that the summation be started during a period of low density flows.) Another finding was that the SumSR(t) variable was a better detector of loop “chattering” errors than WSDOT's current criterion, which misses chattering errors that occur at normal traffic volume levels. Since calculation of SumSR(t) is easily incorporated in the current WSDOT ramp metering algorithm, the writer recommends its use in futute WSDOT freeway metering schemes.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Daganzo, C. F. (1994). “The cell transmission model: A dynamic representation of highway traffic consistent with the hydrodynamic theory.”Transp. Res., 28B(4), 269–287.
2.
Davis, G., Nihan, N., Hamed, M., and Jacobson, L. (1990). “Adaptive forecasting of freeway traffic congestion.”Transp. Res. Rec. 1287, Transp. Res. Board, National Research Council, Washington, D.C.
3.
Gazis, D. C.(1971). “On-line estimation of traffic densities from time-series of flow and speed data.”Transp. Sci., 5(3), 283–301.
4.
Jacobson, L., Henry, K., and Mehyar, O. (1989). “Real-time metering algorithm for centralized control.”Transp. Res. Rec. 1232, Transp. Res. Board, National Research Council, Washington, D.C.
5.
Kurkjian, et al.(1980). “Estimation of roadway traffic densities on freeways using presence detector data.”Transp. Sci., 14, 232–261.
6.
Nihan, N., Babla, M. (1993). “Application of pattern recognition to forecast congested conditions, Volume II.”Joint TransNow/WSDOT Final Rep. No. WA-RD 288.2, University of Washington, Seattle, Wash.
7.
Nihan, N. L. (1995). “Freeway congestion prediction.”Final Rep. WA-RD 381.1, Washington State Department of Transportation.
8.
Nihan, N. L., and Zhu, J. (1993). “Short term forecasts of freeway traffic volumes and lane occupancies, Volume IV.”Joint TransNow/WSDOT Final Rep. No. WA-RD 288.4, University of Washington, Seattle, Wash.
9.
Szeto, H. W., and Gazis, D. C.(1972). “Application of Kalman filtering to the surveillance and control of traffic systems.”Transp. Sci., 11, 419–439.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 123 • Issue 6 • November 1997
Pages: 454 - 458
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Nov 1, 1997
Published in print: Nov 1997
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.