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Traffic Monitoring Guide Truck Weight Monitoring Section 5.

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Presentation on theme: "Traffic Monitoring Guide Truck Weight Monitoring Section 5."— Presentation transcript:

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

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

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-Ceramic WIM System

26 Picture of Capacitance Mat WIM System

27 Picture of Capacitance Strip WIM System

28 Picture of Bridge WIM System With 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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