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WEIGH-IN-MOTION SYSTEM CALIBRATION. CURRENT CHALLENGES Significant Growth in CMV Traffic Increased congestion and delay Demand for larger and heavier.

Published byDortha Chambers Modified over 9 years ago

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Presentation on theme: "WEIGH-IN-MOTION SYSTEM CALIBRATION. CURRENT CHALLENGES Significant Growth in CMV Traffic Increased congestion and delay Demand for larger and heavier."— Presentation transcript:

1 WEIGH-IN-MOTION SYSTEM CALIBRATION

2 CURRENT CHALLENGES Significant Growth in CMV Traffic Increased congestion and delay Demand for larger and heavier vehicles Mounting stress on infrastructure Greater need for effective and efficient enforcement

3 CURRENT CHALLENGES Traditional WIM System Calibration Method Limitations Field calibration procedures – Costly to perform – Occur infrequently Auto-calibration procedures – May lead to progressive drift Multiple weight sensor installation – Costly – Provides modest gains in accuracy Post-collection data editing – provides only general indication of data conformance to expected weight distributions – not timely in flagging WIM performance problems

4 BACKGROUND 2006 European Scan Tour Emerging technologies Unconventional procedures Novel data applications Innovative funding mechanisms Multinational harmonization THE NETHERLANDS BELGIUM GERMANY FRANCE SLOVENIA SWITZERLAND

5 EUROPEAN APPROACH WIM System Calibration Continuous calibration – France, The Netherlands, during scheduled enforcement Quality assurance – The Netherlands issues QA Statement with every data request Dynamic calibration – The Netherlands utilizes specially designed vehicle

6 SUPPORTING TECHNOLOGIES Overheight Vehicle Detection System Vehicle Profiler System WIM Systems – In-road – Bridge Dynamic Calibration Vehicle Vehicle Identification System Advanced Routing/Permitting System Archived Records Database

7 SUPPORTING TECHNOLOGIES In-road WIM System Functions Measures and records axle, gross weight using piezo quartz, piezo ceramic, fiber optic sensors Considerations Provides 24/7 monitoring May be less accurate than traditional WIM systems Low cost supports wider implementation Estimated Cost $9,000 - $32,500 per lane Varies by sensor type, on-site communication requirements Requires additional, ongoing maintenance with associated costs

8 SUPPORTING TECHNOLOGIES Bridge WIM System Functions Measures, records weight using existing structures instrumented with strain transducers/gauges Measures, records axles using traditional sensors or Nothing-on-Road/Free-of-Axle Detector (NORFAD) systems Considerations Requires suitable bridge and location Most successful on short, stiff bridges Structural assessments require transducer calibration Calibration may require specialized expertise Estimated Cost $100,000 - $130,000 per bridge/system Varies by sensor type, on-site communication requirements

9 SUPPORTING TECHNOLOGIES Vehicle Identification System Functions Cameras capture vehicle silhouette, license plate images OCR software converts license plate image to numeric data Images/data transmitted via DSRC to portable computer used by enforcement officials Considerations Conversion of license plate images may result in errors Estimated Cost $52,000 - $80,000 per system Varies by camera type, on-site communication requirements

10 SUPPORTING TECHNOLOGIES Archived Records Database Functions Supports data-driven enforcement scheduling Supports preventative carrier contacts Supports enhanced data quality Encourages long-term performance monitoring Considerations Requires procedures for quality control Estimated Cost $225,000 - $300,000

11 SUPPORTING TECHNOLOGIES Dynamic Calibration Vehicle Functions Calibrates dynamic load measurements to true dynamic - rather than static - loads Considerations May be used to calibrate traditional static weigh bridges Estimated Cost $1.72 million for vehicle construction $6,300 per in-service day

12 IMPLEMENTATION CONTINUOUS CALIBRATION Dynamic Calibration Vehicle Archived Records Database Vehicle Identification System Bridge WIM System In-road WIM System AND/OR DSRC Camera/OCR Database Computer Interface/Software Weight/Axle Sensors (X Weight Accuracy) Computer Interface/Software Voltage/Axle Sensors (X Weight Accuracy)

13 IMPLEMENTATION CONTINUOUS CALIBRATION QUALITY ASSURANCE Dynamic Calibration Vehicle Archived Records Database Vehicle Identification System Bridge WIM System In-road WIM System AND/OR Database DSRC Camera/OCR Database DSRC Camera/OCR Computer Interface/Software Weight/Axle Sensors (X Weight Accuracy) Computer Interface/Software Weight/Axle Sensors (X Weight Accuracy) Computer Interface/Software Voltage/Axle Sensors (X Weight Accuracy) Computer Interface/Software Voltage/Axle Sensors (X Weight Accuracy)

14 IMPLEMENTATION CONTINUOUS CALIBRATION QUALITY ASSURANCE DYNAMIC CALIBRATION Dynamic Calibration Vehicle Archived Records Database Vehicle Identification System Bridge WIM System In-road WIM System AND/OR Database DSRC Camera/OCR Database DSRC Camera/OCR Computer Interface/Software Weight/Axle Sensors (X Weight Accuracy) Computer Interface/Software Weight/Axle Sensors (X Weight Accuracy) Computer Interface/Software Weight/Axle Sensors (X Weight Accuracy) Computer Interface/Software Voltage/Axle Sensors (X Weight Accuracy) Computer Interface/Software Voltage/Axle Sensors (X Weight Accuracy) Dynamic Calibration Vehicle Computer Interface/Software Voltage/Axle Sensors (X Weight Accuracy)

15 BENEFITS Eliminates need for resource-intensive manual field calibration Enhanced weight data quality benefits broader transportation and enforcement agency activities – Planning and programming – Enforcement – Design and engineering

16 FUNCTIONAL INTERFACE

17 QUESTIONS

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