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Imputation Model for Link Travel Speed Measurement Using UTIS  

Ki, Yong-Kul (도로교통공단 교통과학연구원)
Ahn, Gye-Hyeong (도로교통공단 교통과학연구원)
Kim, Eun-Jeong (도로교통공단 교통과학연구원)
Bae, Kwang-Soo (도로교통공단 교통과학연구원)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.10, no.6, 2011 , pp. 63-73 More about this Journal
Abstract
Travel speed is an important parameter for measuring road traffic. UTIS(Urban Traffic Information System) was developed as a mobile detector for measuring link travel speeds in South Korea. After investigation, we founded that UTIS includes some missing data caused by the lack of probe vehicles on road segments, system failures and etc. Imputation is the practice of filling in missing data with estimated values. In this paper, we suggests a new model for imputing missing data to provide accurate link travel speeds to the public. In the field test, new model showed the travel speed measuring accuracy of 93.6%. Therefore, it can be concluded that the proposed model significantly improves travel speed measuring accuracy.
Keywords
UTIS; Missing data; imputation; ITS; probe-car;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 강경표 외, "교통정보공학론," 청문각, 2008.
2 서울특별시, 도시고속도로 교통관리시스템(3단계)설치공사 기본설계보고서, 2003.
3 변완희, 김주현, "교통시스템 설계론," 청문각, 2002.
4 김동효 외, "중앙교통정보센터 교통정보 수집체계 신뢰성 검증용역 보고서," 서울지방경찰 청,2004.
5 L. A. Frechete and A. M. Khan, "Bayesian Regression-Based Urban Traffic Models," In Transportation Research Record, TRB, Washington, D.C., no. 1644, pp.157-163, 1998.
6 J. Kwon, B. Coifman and P. Bickel, "Day-to-Day Travel-Time Trends and Travel-Time Prediction from Loop-Detector Data," In Transportation Research Record, TRB, Washington, D.C., no. 1717, pp.120-129, 2000.
7 C. P. IJ. Hinsbergen and J.W.C. Lint, "Bayesian Combination of Travel Time Prediction Models," In Transportation Research Record, TRB, Washington, D.C., no. 2064, pp.73-80, 2008.
8 H. Xu and M. Barth, "Travel Time Estimation Techniques for Traffic Information Systems Based on Inter vehicle Communications," In Transportation Research Record, TRB, Washington, D.C., no. 1944, pp.72-81, 2006
9 W. Pu, J. Lin and L. Long, "Real-Time Estimation of Urban Street Segment Travel Time Using Buses as Speed Probes," In Transportation Research Record, TRB, Washington, D.C., no. 2129, pp.81-89, 2009.
10 A. Demers, G. F. List, W. A. Wallace, E. E. Lee and J. M. Wojtowicz, "Probes as Path Seekers : A New Paradigm," In Transportation Research Record, TRB, Washington, D.C., no. 1944, pp.107-114, 2006.
11 기용걸, 안계형, 김은정, 정준하, 배광수, 이철기,"UTIS 구간통행속도 이상치 제거 알고리즘," 한국ITS학회논문지, 제9권, 6호, pp.33-42, December2010.
12 J. Wang, N. Zou and G-L. Chang, "Travel Time Prediction : Empirical Analysis of Missing Data Issues for Advanced Traveler Information System Applications," In Transportation Research Record, TRB, Washington, D.C., no. 2049, pp.81-91, 2008.
13 B. L. Smith, W. T. Scherer and J. H. Conklin, "Exploring Imputation Techniques for Missing Data in Transportation Management Systems," In Transportation Research Record, TRB, Washington, D.C., no. 1836, pp.132-142, 2003.