01020856

Component

https://doi.org/10.3141/1945-09

http://scholar.google.com...ihan&publication_year=2006

Freeway traffic speed and bin volumes for different vehicle categories are typically collected by dual-loop detectors. Good quality dual-loop detector data are crucial for effective real-time traffic management systems and traveler information systems. However, loop detectors are subject to various malfunctions that can result in erroneous measurements. Previous studies indicated that loop sensitivity-level discrepancies between two single loops forming a dual-loop detector and unsuitable sensitivity levels of the single loops are two major causes of quality degradation in dual-loop data. This paper presents an algorithm and its implementation for identifying and correcting such loop sensitivity problems. The algorithm identifies dual-loop sensitivity problems using individual vehicle data extracted from loop event data and corrects dual-loop sensitivities through a two-step procedure: (a) remove the sensitivity discrepancy between the two single loops and (b) adjust their sensitivities to the appropriate level. Elimination of dual-loop sensitivity problems significantly enhances the reliability of dual-loop detectors and improves the quality of traffic speed and bin volume data.

01031684

English

0000-0002-4180-5628

pp 73-81

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099536

Print

Figures (6) ; References (23) ; Tables (3)

Accuracy; Algorithms; Data collection; Data quality; Reliability; Sensitivity; Traffic data; Traffic speed; Traffic volume

Dual loop detectors

Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Mar 3 2006 10:22AM

• Accuracy Assessment of Traffic Monitoring Devices Vehicle by Vehicle
• Artificial Neural Network Method for Length-Based Vehicle Classification Using Single-Loop Outputs
• Calculation of Travel Time Variability from Loop Detector Data
• Cellular-Based Data-Extracting Method for Trip Distribution
• Characterization of Truck Traffic in California for Mechanistic-Empirical Design
• Detection of Invalid Loop Detector Data in Urban Areas
• Effect of Sensor Spacing on Performance Measure Calculations
• Evaluation of Quartz Piezoelectric Weigh-in-Motion Sensors
• Identifying Lane-Mapping Errors at Freeway Detector Stations
• Sensitivity of NCHRP 1-37A Pavement Design to Traffic Input
• Statistical Investigations of Statutory Holiday Effects on Traffic Volumes
• Using Automatic Vehicle Identification Data to Gain Insight into Travel Time Variability and Its Causes