Analysis of Required Minimum Sample Size of Floating Cars for Estimating Urban Road Link Travel Time Considering Bimodal Distribution and Estimation Error
Despite the wide application of floating car data (FCD) in urban road link travel time and congestion estimation, limited efforts have been made on determining the minimum sample size of floating cars and its impact on travel time estimation error. This study contributes to determining the required minimum sample size of floating cars and the corresponding travel time estimation errors considering the bimodal nature of interrupted flow on urban road links. Travel times are drawn from two populations: one representing non-stop movement through signalized intersection and one representing vehicles which stop at traffic lights. Hellinger distance comparison is made between the distribution of travel times from FCD and Radio Frequency Identification Data (RFID) for the studied road link, where RFID is treated as the real travel time distribution pattern because its capability as a full-sample sensor. This study obtains the Hellinger distances with respect to different sample sizes of FCD from two populations using the genetic algorithm, from which the minimum FCD sample sizes corresponding to different levels of travel time estimation errors can be identified. This study also quantifies two critical factors that affect the minimum required FCD sample size and provide recommendations for FCD sampling of two populations.
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Supplemental Notes:
- This paper was sponsored by TRB committee ABJ30 Standing Committee on Urban Transportation Data and Information Systems.
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Yun, Mei-Ping
- Qin, Wen-wen
- Yu, Jie
- Liu, Yue
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Conference:
- Transportation Research Board 96th Annual Meeting
- Location: Washington DC, United States
- Date: 2017-1-8 to 2017-1-12
- Date: 2017
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; References;
- Pagination: 17p
- Monograph Title: TRB 96th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Errors; Floating car data; Radio frequency identification; Representative samples; Statistical distributions; Travel time
- Geographic Terms: Nanjing (China)
- Subject Areas: Data and Information Technology; Highways;
Filing Info
- Accession Number: 01627778
- Record Type: Publication
- Report/Paper Numbers: 17-03296
- Files: TRIS, TRB, ATRI
- Created Date: Feb 27 2017 5:12PM