Traffic queue estimation for metered motorway on-ramps through use of loop detector time occupancies

Lee, Jinwoo (Brian), Jiang, Rui, & Chung, Edward (2013) Traffic queue estimation for metered motorway on-ramps through use of loop detector time occupancies. Transportation Research Record, 2396, pp. 45-53.

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The primary objective of this study is to develop a robust queue estimation algorithm for motorway on-ramps. Real-time queue information is a vital input for dynamic queue management on metered on-ramps. Accurate and reliable queue information enables the management of on-ramp queue in an adaptive manner to the actual traffic queue size and thus minimises the adverse impacts of queue flush while increasing the benefit of ramp metering. The proposed algorithm is developed based on the Kalman filter framework. The fundamental conservation model is used to estimate the system state (queue size) with the flow-in and flow-out measurements. This projection results are updated with the measurement equation using the time occupancies from mid-link and link-entrance loop detectors.

This study also proposes a novel single point correction method. This method resets the estimated system state to eliminate the counting errors that accumulate over time. In the performance evaluation, the proposed algorithm demonstrated accurate and reliable performances and consistently outperformed the benchmarked Single Occupancy Kalman filter (SOKF) method. The improvements over SOKF are 62% and 63% in average in terms of the estimation accuracy (MAE) and reliability (RMSE), respectively. The benefit of the innovative concepts of the algorithm is well justified by the improved estimation performance in congested ramp traffic conditions where long queues may significantly compromise the benchmark algorithm’s performance.

Impact and interest:

2 citations in Scopus
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2 citations in Web of Science®

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121 since deposited on 09 Apr 2013
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ID Code: 58999
Item Type: Journal Article
Refereed: Yes
Keywords: Queue, Traffic queue, Motorway, On-ramp, Queue estimation
DOI: 10.3141/2396-06
ISSN: 0361-1981
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Transport Engineering (090507)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Current > Research Centres > Smart Transport Research Centre
Copyright Owner: Copyright 2013 National Research Council (U.S.). Transportation Research Board
Deposited On: 09 Apr 2013 04:28
Last Modified: 27 Apr 2014 05:59

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