Saturation flow rate estimation under rainy weather conditions for on-line traffic control purpose
- 187 Downloads
The capacity or saturation flow rate of an urban street intersection is defined by physical factors of the roadway, traffic factors, and environmental disturbances. Roadway is fixed by design and construction its physical characteristics exert a constant influence on intersection capacity. Traffic factors have various effects on capacity, but they are also subject to control and regulation to a great degree. Environmental factors cannot be controlled, and thus their effect can be compensated for only by preparation in advance of occurrence. Rain, the most common environmental disturbance to the saturation flow rate that is a base value for capacity, was studied in this research. Rainfall information for September 1997 in Seoul Metropolitan area was correlated with traffic data records at urban intersections to obtain data indicating the effect of rain on prevailing saturation flow rates. Rain was found to reduce the saturation flow rate of intersection to between 87 and 96 percent of the dry weather flow rate. The study also recommends possible revisions in the saturation flow rate estimation algorithm being tested for future deployment of the “New Signal Control Systems”.
KeywordsWeather saturation flow rate signalized intersection rain control
Unable to display preview. Download preview PDF.
- 1.Transportation Research Board (1994) Highway Capacity Manual.TRB Special Report 209. 3rd Edition.Google Scholar
- 2.Transportation Research Board (1985) Highway Capacity Manual.TRB Special Report 209.Google Scholar
- 3.Moskowitz, K. and Newman, L. (1963)Notes on Freeway Capacity. Highway Research Rcord, 27.Google Scholar
- 4.Reis, G. (1981)Impact of Weather on Freeway Capacity. Minnesota DOT.Google Scholar
- 5.Jones, E. R. and Goolsby, M. E. (1970)The Environmental Influence of Rain on Freeway Capacity. Highway Research Record, 321.Google Scholar
- 6.Kleisch and Cleveland (1971) The Effect of Rainfall on Freeway Capacity.Report TR S-6. Highway Safety Research Institute, University of Michigan.Google Scholar
- 7.McShane, W. and Roess, R. (1992)Traffic Engineering. Prentice-Hall.Google Scholar
- 8.Korean Ministry of Construction (1992)The Korean Highway Capacity Manual.Google Scholar
- 9.City of Seoul (1993)Development of New Traffic Control Systems: Phase 3 Report.Google Scholar