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- Title
Comparative analysis of probe-based ramp metering with detector-based and pretimed ramp metering.
- Authors
Kattan, Lina; Saidi, Saeid
- Abstract
SUMMARY In this paper, a probe-based adaptive ramp metering approach has been developed and compared with a detector-based and pretimed ramp metering approaches using PARAMICS microsimulation model made by Quadstone Limited. Both examined probe-based and detector-based ramp metering approaches adopt the same problem formulation; however, they differ by the data source that provides estimates of their input parameters. The probe-based approach takes as main input space mean speed extracted from vehicle probes moving constantly on the entire freeway. The detector-based approach takes the density readings directly from point detectors placed upstream and downstream of each on-ramp. The developed approach formulates the ramp metering rates to simultaneously reduce freeway travel time and decrease delays on ramps. A dynamic weighting scheme is adopted in this formulation to give different weighting schemes to the various freeway sections and the on-ramps. These weights are able to adjust dynamically based on prevailing and forecasted traffic conditions to give priority in each step to the sections of the freeways or/and on-ramps experiencing critical traffic conditions. The comparative analysis of the three ramp metering approaches was conducted on an 8-km freeway section on Highway 2 in Calgary, Alberta, Canada. The results of the analysis indicate that the probe-based algorithm consistently outperformed the two other approaches in terms of all performance measures. The probe-based approach is shown to exceed the performance of the detector-based approach with a market share of vehicle probes as low as 3%. The results of the analysis are promising and show the effectiveness of developing ramp metering control algorithms taking the main input parameters from vehicle probes on the freeway. Copyright © 2012 John Wiley & Sons, Ltd.
- Subjects
COMPARATIVE studies; RAMP metering (Traffic engineering); DETECTOR (Film); DETECTORS; MICROSIMULATION modeling (Statistics); DYNAMICS; PERFORMANCE evaluation
- Publication
Journal of Advanced Transportation, 2013, Vol 47, Issue 1, p61
- ISSN
0197-6729
- Publication type
Article
- DOI
10.1002/atr.1187