Presentation Transcript

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