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Weigh-In-Motion (WIM) Data Collection & Reporting

Weigh-In-Motion (WIM) Data Collection & Reporting. Office of Highway Policy Information. 2012 Highway Information Seminar - Session: 6B Thursday , October 25, 2012 8:00 am – 9:30 a m By: David L. Jones Sr. ,Transportation Specialist. OBJECTIVE. Provide Background and Update

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Weigh-In-Motion (WIM) Data Collection & Reporting

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  1. Weigh-In-Motion (WIM) Data Collection & Reporting Office of Highway Policy Information 2012 Highway Information Seminar - Session: 6B Thursday, October 25, 2012 8:00 am – 9:30 am By: David L. Jones Sr. ,Transportation Specialist

  2. OBJECTIVE • Provide Background and Update • Describe Truck Weight Program • State Reporting Requirements (TMG) Update • WIM System Deployment & Sensor Technology • Identify Data Collection Issues • TWS Status & National Loading Trends • Open Discussions dialogue

  3. 1939 Type A • Loadometer 181 Years of Vehicle Weighing • 1831Thaddeus Fairbanks • 1918 BPRs First Road Test • 1934 Hayden-Cartwright Act

  4. 1942Strain Gage Load Cell 181 Years of Vehicle Weighing • 1950O.K. Norman

  5. 181 Years of Vehicle Weighing • 1985Traffic Monitoring Guide • 1955AASHO Road Test Approved • 1971TWS Manual • 2012Traffic Monitoring Guide Update

  6. TMG Update Project Goals • Ensure Quality Input Data • Provide Latest Procedural and Program Guidelines • Transferable Techniques and Procedures • ITS Data • Bike and Pedestrian

  7. Table Of Contents • Chapter 1 – Traffic Monitoring Theory, Technology, and Concepts • Chapter 2 – Traffic Monitoring Program – Business Planning and Design • Chapter 3 – Traffic Monitoring Methodologies • Chapter 4 – Traffic Monitoring for Non-Motorized Traffic

  8. Table Of Contents • Chapter 5 – Transportation Management and Operations • Chapter 6 – HPMS Requirements for Traffic Data • Chapter 7 – Traffic Monitoring Data Formats • Appendices:

  9. What’s New • Speed • Non-motorized data • Data Formats • Reporting Requirements • Expanded Examples, Appendixes and References

  10. Other Associated Work • Updated ~2+ days NHI TMG Training Course • Public Website: http://fhwatmgupdate.camsys.com/ Project Information // Project Schedule // Panel Members // Panel // Public Review and Comment

  11. Weigh-In-Motion? • Process of Measuring Dynamic Tire Forces • Using in Pavement Sensors • To Estimate a Static Vehicle Weight

  12. Why Weigh?

  13. Pavement Design / Maintenance

  14. Pavement Design / Maintenance • Bridge Design / Loading

  15. Pavement Design / Maintenance • Bridge Design / Loading

  16. Pavement Design / Maintenance • Bridge Design / Loading • Enforcement

  17. Pavement Design / Maintenance • Bridge Design / Loading • Enforcement • Research

  18. Pavement Design / Maintenance • Bridge Design / Loading • Enforcement • Research • Freight Movement

  19. Why Weigh in Motion? • TrafficStream • Use of the Highway System

  20. 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

  21. Heavily Loaded Moderately Loaded Lightly Loaded • Define truck weight roadway groups 0.16 Tandem Axle Load Distributions 0.14 0.12 0.1 Fraction of Axles in Each Weight Group 0.08 0.06 0.04 0.02 0 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 Maximum Weight in a Given Weight Group (x 1,000 lbs)

  22. Define truck weight roadway groups

  23. Define truck weight roadway groups • 6 sites / group

  24. Define truck weight roadway groups • 6 sites / group • One continuous WIM within group Capture day-of-week and seasonal changes within each group

  25. Define truck weight roadway groups • 6 sites / group • One continuous WIM within group Capture day-of-week and seasonal changes within each group D. Calibrate, Calibrate, Calibrate

  26. Criteria for Groups • Can be easily applied in any state • Logical means for disguising between heavy and light loaded roadways

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

  28. Reporting Requirements Minimum quarterly WIM submittal truck weight data from permanent weight-in-motion (WIM) sites within 26 days after the close of the quarter. ***Monthly WIM Submittal is Encouraged***

  29. Truck Weight Study Status

  30. TMAS Products • System wide Vehicle weight by vehicle class • Axle Load Distribution • Equivalent Single Axle Load (ESAL) • Day-of-Week and Seasonal Patterns

  31. 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: https://fhwaapps.fhwa.dot.gov/vtris-wp/

  32. Rural Interstate Travel by Vehicle Type Distribution of Average Daily Traffic Volumes and Equivalent Axle Loads on the Rural Interstate System as a Percent of Total 100 92 80 80 Automobiles, Buses and Light Trucks 60 Heavy Single Unit Trucks Percent All Combination Trucks 40 20 16 6 4 2 0 Average Daily Traffic Equivalent Single Axle Loads 1 Equivalent axle loads provide a means of measuring vehicle wear on pavements by relating them to an 80 kilonewton (18,000 pound) single axle load. All 2-axle, 4-tire trucks. Includes pickup trucks, panel trucks, vans and other vehicles (such as campers, motor homes, etc.) 2 All vehicles on a single frame have either 2 axles and 6 tires or 3 or more axles (including camping and recreational vehicles and 3 motor homes.)

  33. Urban Interstate Travel by Vehicle Type Distribution of Average Daily Traffic Volumes and Equivalent Axle Loads on the Rural Interstate System as a Percent of Total 100 89 82 80 Automobiles, Buses and Light Trucks 60 Heavy Single Unit Trucks Percent 3- & 4-Axle Combination Trucks 40 20 14 7 4 4 0 Average Daily Traffic Equivalent Single Axle Loads 1 Equivalent axle loads provide a means of measuring vehicle wear on pavements by relating them to an 80 kilonewton (18,000 pound) single axle load. All 2-axle, 4-tire trucks. Includes pickup trucks, panel trucks, vans and other vehicles (such as campers, motor homes, etc.) 2 All vehicles on a single frame have either 2 axles and 6 tires or 3 or more axles (including camping and recreational vehicles and 3 motor homes.)

  34. Distribution of Vehicle Travel by Lane by Vehicle Type 100 88.7 90 78.7 80 70 57.1 60 42.9 Percent 50 40 21.3 30 11.3 20 10 0 Lane 2 Lane 1 Source: VTRIS Truck Weight Study

  35. Greater than 10M tons per year 5 to 10 M tons per year Less than 5 M tons per year

  36. Monthly Average GVW Variations

  37. Hourly Average GVW Variations

  38. Data Quality Act Data Quality Quality Assurance Statement The Federal Highway Administration provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement. Requests for Correction On October 1, 2002, the Department of Transportation (DOT) issued agency guidelines to ensure the quality of disseminated information. If you are affected by information that the Department has disseminated on or after October 1, 2002 (i.e., if you are harmed because the information does not meet the standards of the guidelines or a correction of the information would benefit you), you may request that the Department correct that information. We regard information originally disseminated before October 1, 2002, as being subject to this correction process only if it remains readily available to the public (e.g., it is posted on a DOT website) and it continues to play a significant, active role in Department programs or in private sector decisions. Information on how to submit a request can be found at http://dms.dot.gov/dataquality.cfm

  39. Data Quality Elements • Data collection • Data Processing • Process improvement • Implementation plan • Data quality program.

  40. WIM’s Future Role FUTURE

  41. Travel Monitoring Analysis System • National estimates of heavy vehicle highway travel on a monthly basis • National estimates of axle loadings and highway ton-miles of freight moved each month, and • Highway specific estimates of truck volumes and loadings

  42. Travel Monitoring Analysis System • Traffic Volume Trends • GIS • Freight Management • Safety “THE EASY BUTTON”

  43. Session 6B Summary • Truck Weight User Needs? • Truck Weight Program Components? • Submittal Requirements? • Data Quality? • Truck Weight Data Reports?

  44. Questions • What questions do you still have about the Traffic Monitoring Program? • Expectations met?

  45. THANK YOU ! David L. Jones Sr. djones@dot.gov

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