01336697

Component

https://doi.org/10.3141/2229-05

http://scholar.google.com...aiya&publication_year=2011

Four queue estimation methodologies were studied with wireless magnetic sensors installed on a single-lane loop on-ramp. Queue length estimation based on (a) occupancy measurements at the ramp entrance, (b) vehicle counts at the on-ramp entrance and exit, (c) speed measurements at the ramp entrance, and (d) vehicle reidentification were considered. These queue estimation methods were evaluated with available raw and processed sensor data retrieved from the test site through mobile data communication and downloaded from a server. The accuracy and reliability of the queue estimation methods were studied with ground truth data obtained from video. Discrepancies between inconsistent sensor and ground truth data were identified and further analyzed with raw data coming directly from the vehicle detection system at the on-ramp. Each of the methods analyzed had deficiencies that needed to be taken into account and compensated for if they were to be used for applications that involved ramp metering with accurate queue control. The worst performance of the queue estimation methods was observed when the on-ramp was under congestion (queue extends around or beyond the ramp entrance). On the basis of the observations at the on-ramp test site, it was also possible to point out some of the main factors that affect the performance of the queue estimation methods.

01352852

11-3173

English

pp 34-45

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167383

Print

Figures; Photos; References (9)

Freeway operations; On ramps; Ramp metering; Sensors; Traffic congestion; Traffic data; Traffic estimation; Traffic queuing; Vehicle detectors; Wireless sensors

Queue length

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Feb 17 2011 6:25PM

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• Decomposition of Travel Time Reliability into Various Sources: Incidents, Weather, Work Zones, Special Events, and Base Capacity
• Exploiting the Capacity of Managed Lanes in Diverting Traffic Around an Incident
• Managing Highways for Better Reliability: Assessing Reliability Benefits of Ramp Metering
• Novel Freeway Traffic Control with Variable Speed Limit and Coordinated Ramp Metering
• Preliminary Evaluation of Operational Performance of Different Types of High-Occupancy Vehicle Facilities in California: Continuous Access Versus Limited Access
• Quantification of Nonrecurrent Congestion Delay Caused by Freeway Accidents and Analysis of Causal Factors
• Quantifying the Attractiveness of High-Occupancy Toll Lanes with Traffic Sensor Data Under Various Traffic Conditions
• Safety Benefits from Deployment of Open Road Tolling for Main-Line Toll Plazas in Florida
• Spatiotemporal Patterns of Primary and Secondary Incidents on Urban Freeways
• Validation Techniques for Region-Level Microscopic Mass Evacuation Traffic Simulations