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Traffic Monitoring Guide

Traffic Monitoring Guide. Truck Weight Monitoring Section 5. Objective. Identify Truck Weight Users Needs Describe Truck Weight Program Identify Data Collection Issues Describe Truck Weight Data Reports. Data Users. Pavement Design / Maintenance Bridge Design / Loading Enforcement

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Traffic Monitoring Guide

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  1. Traffic Monitoring Guide Truck Weight Monitoring Section 5

  2. Objective • Identify Truck Weight Users Needs • Describe Truck Weight Program • Identify Data Collection Issues • Describe Truck Weight Data Reports

  3. Data Users • Pavement Design / Maintenance • Bridge Design / Loading • Enforcement • Research • Taxation & Administration • Freight Planning

  4. Truck Weight Program • Products • Components • Structure

  5. Products • Gross Vehicle Weights (GVW) • Axle Load Distribution • Equivalent Standard Axle Load (ESAL) • Day-of-Week and Seasonal Patterns

  6. Products

  7. Products

  8. Truck Weight Program Components • Users Needs • End in Mind • 2002 Pavement Design Guide • Resources • Federal-aid and construction funds • Locations • Available funds • Truck Weight Groups • Criteria for groups

  9. Structure of Vehicle Weight Program • Continuous Count Program • Short Term Count Program

  10. Continuous Count Program • Purpose? • How many? • Locations?

  11. Purpose • Temporal distribution • Hourly • Day-of-week • Seasonal • Direction • Axle adjustment factor • Freight studies

  12. How many? • Supplement ATR program • Truck corridors

  13. Short Term Count Program • Purpose? • Segments? • Cycles? • Duration? • Factors?

  14. Purpose? • Spatial distribution (geographical) • Comprehensive • Foundation for AADTT • Axle adjustment factors

  15. Segments? • Homogeneous truck traffic section • Usually longer than volume segments • Not always Between • Intersections • Roadways • Interchanges

  16. Cycles? • Quarterly • Yearly • 2 Years • 3 Years (TMG) • TMG (obsolescence )

  17. Durations? • 24 Hr • 48 Hr (TMG) • 72 Hr • 7 - days

  18. Types of Weighing • Static Weighing • Weight-in-Motion

  19. Static Weighing • Advantages • Accurate weight and dimensions • Permanent scales • Disadvantages • Time consuming • Safe site • Resource intensive

  20. Picture of Static Weighing

  21. Weigh-in-Motion (WIM) • Advantages • More vehicle weighed • Better coverage • Unbiased sample • Disadvantages • Higher installation costs • Higher equipment and maintenance costs • Fixed locations

  22. WIM Sensor Technology • “ Load Cell” – Hydraulic load cells • “Bending Plates” – Strain gauge load cells • “Piezo” – Piezo-electric cables / film / quartz • Fiber Optics • Capacitance mats / pads / strips • Strain gauges on bridge beams

  23. Picture of Load Cell WIM System

  24. Picture of Bending Plate WIM System

  25. Picture of Piezo-CeramicWIM System

  26. Picture of Capacitance MatWIM System

  27. Picture of Capacitance Strip WIM System

  28. Picture of Bridge WIM SystemWith Strain Gauges

  29. WIM Calibration • Calibration Issues • Actual vs. WIM • Test truck and random truck • Auto-calibration and re-calibration • Front Axle • Temperature

  30. Reference Materials • WIM Handbook • ASTM WIM Standard • Long Term Pavement Performance

  31. Software and Reports • Vehicle Travel information System (VTRIS) • Truck Weight Study (TWS)

  32. VTRIS(Vehicle Travel Information System) • Windows-based System • FoxPro data base (DBF) • Data Base Management System • Load / Validate • Generate summary file • Produce W-Tables • Archive and ship data

  33. VTRIS • Products • System wide weight and ESAL’s values • Vehicle weight by vehicle class • Weight distribution

  34. W-Tables (TWS) • W1-Weigh Station Characteristics • W2-Comparison of Weighted vs. Counted • W3-Average Empty, Loaded, and Cargo Weights • W4-Equivalency Factors • W5-Gross Vehicle Weights • W6-Overweight Vehicle Report • W7-Distribution of Overweight Vehicles VTRIS Reports: http://apps.fhwa.dot.gov/vtris/vtris.aspx

  35. Summary • Truck weight User Needs • Truck Weight Program • WIM Issues • Truck Weight Data Reports

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