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Development of Density Measurement Technique Based on Two Point Detectors and Measurement Reliability According to Different Sensing Gaps  

Lee, Cheong-Won (서울시립대학교 교통공학과)
Kim, Min-Seong (서울시립대학교 교통공학과)
Park, Jae-Yeong (서울시립대학교 교통공학과)
Lee, Eun-Gyu (서울시립대학교 교통공학과)
Publication Information
Journal of Korean Society of Transportation / v.28, no.3, 2010 , pp. 157-167 More about this Journal
Abstract
Density is the most important congestion indicator among the three fundamental flow variables, flow, speed and density. Measuring density in the field has two different ways, direct and indirect. Taking photos with wide views is one of direct ways, which is not widely used because of its cost and lacking of proper positions. Another direct density measuring method using two point detectors has been introduced with the concept of instantaneous density, average density and measurement interval. The relationship between accuracy and measurement interval has been investigated using the SIMULATION data produced by Paramics Application Programming Interface function. We analyze the affect of segment density accuracy by sensing gap each road condition such as sensing segment length, lane and LOS after gathering data by Paramics Application Programming Interface.
Keywords
Density; Sensing Gaps; Density Detector Measurement; Verification; Algorithm;
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Times Cited By KSCI : 1  (Citation Analysis)
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