01152859

Component

https://doi.org/10.3141/2192-02

http://scholar.google.com...lock&publication_year=2010

Compact wireless magnetometers offer attractive vehicle detection ability at signalized intersections because their installation requires minimal pavement cutting and the detectors are less likely than saw-cut inductive loops to malfunction because of pavement failure. A study was done at an instrumented intersection to evaluate the performance of wireless magnetometers at operating signalized intersections. A test bed was constructed with colocated inductive loop and wireless magnetometer detection zones. A 5-day analysis period was conducted for each of two left-turn pockets at an actuated, coordinated signalized intersection. Discrepancies between the detection and nondetection states were quantified with high-resolution log data of traffic events, and 240 h of data collection that was ground-truthed by visual inspection of video recordings of the detection zones. Behavior of detector state changes was also characterized. Wireless magnetometers were found to perform similarly to loops in relation to missed calls and had a slightly higher tendency to generate false detection calls. Detection state changes in the wireless magnetometers had typical (85th percentile) reporting latencies of 0.2 s or less for activation and 0.5 s or less for state termination. The paper concludes by recommending 8-ft spacing of the sensors adjacent to the stop bar to minimize missed calls.

01329030

10-0007

English

pp 11-23

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309160674

Print

Figures (9) ; References (17) ; Tables (4)

Field tests; Highway traffic control; Magnetometer detectors; Signalized intersections; Traffic actuated controllers; Traffic signal control systems; Vehicle detectors; Wireless communication systems

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Jan 25 2010 10:06AM

• Analytical Models for Protected plus Permitted Left-Turn Capacity at Signalized Intersection with Heavy Traffic
• Arterial Performance Measures with Media Access Control Readers: Portland, Oregon, Pilot Study
• Cross-Evaluation of Signal Timing Optimized by Various Traffic Simulation and Signal Optimization Tools
• Crosstalk Detection in Signalized-Intersection Loop Detectors
• Decision Tree Model to Prioritize Signalized Intersections near Highway–Railroad Crossings for Railroad Interconnect
• Evaluation of Arterial Signal Coordination: Methodologies for Visualizing High-Resolution Event Data and Measuring Travel Time
• Framework for Evaluating Advance-Detection Designs for High-Speed Intersection Approaches
• Generating More Equitable Traffic Signal Timing Plans
• Hardware-in-the-Loop Simulation Evaluation of Adaptive Signal Control
• Outcome-Oriented Performance Measures for Management of Signalized Arterial Capacity
• Robust Signal Timing for Arterials Under Day-to-Day Demand Variations
• Signal Priority near Major Bus Terminal: Case Study of Ruggles Station, Boston, Massachusetts
• Simulation-Based Optimization of Maximum Green Setting under Retrospective Approximation Framework
• Supplementing Signalized Intersection Infrastructure to Provide Automated Performance Measures with Existing Video Detection Equipment
• Track Clearance Performance Measures for Railroad-Preempted Intersections
• Traffic Signal Transition in Coordinated Meshed Networks
• Uncertainty and Predictability of Urban Link Travel Time: Delay Distribution–Based Analysis