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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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slide1

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

slide2

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
slide3

1939 Type A

  • Loadometer

181 Years of Vehicle Weighing

  • 1831Thaddeus Fairbanks
  • 1918 BPRs First Road Test
  • 1934 Hayden-Cartwright Act
slide4

1942Strain Gage Load Cell

181 Years of Vehicle Weighing

  • 1950O.K. Norman
slide5

181 Years of Vehicle Weighing

  • 1985Traffic Monitoring Guide
  • 1955AASHO Road Test Approved
  • 1971TWS Manual
  • 2012Traffic Monitoring Guide Update
slide6

TMG Update Project Goals

  • Ensure Quality Input Data
  • Provide Latest Procedural and Program Guidelines
  • Transferable Techniques and Procedures
  • ITS Data
  • Bike and Pedestrian
slide7

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
slide8

Table Of Contents

  • Chapter 5 – Transportation Management and Operations
  • Chapter 6 – HPMS Requirements for Traffic Data
  • Chapter 7 – Traffic Monitoring Data Formats
  • Appendices:
slide9

What’s New

  • Speed
  • Non-motorized data
  • Data Formats
  • Reporting Requirements
  • Expanded Examples, Appendixes and References
slide10

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

slide11

Weigh-In-Motion?

  • Process of Measuring Dynamic Tire Forces
  • Using in Pavement Sensors
  • To Estimate a Static Vehicle Weight
slide14
Pavement Design / Maintenance
  • Bridge Design / Loading
slide15
Pavement Design / Maintenance
  • Bridge Design / Loading
slide16
Pavement Design / Maintenance
  • Bridge Design / Loading
  • Enforcement
slide17
Pavement Design / Maintenance
  • Bridge Design / Loading
  • Enforcement
  • Research
slide18
Pavement Design / Maintenance
  • Bridge Design / Loading
  • Enforcement
  • Research
  • Freight Movement
w hy weigh in motion
Why Weigh in Motion?
  • TrafficStream
  • Use of the Highway System
truck weight program components
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
slide21

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)

slide24
Define truck weight roadway groups
  • 6 sites / group
  • One continuous WIM within group

Capture day-of-week and seasonal changes within each group

slide25
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

criteria for groups
Criteria for Groups
  • Can be easily applied in any state
  • Logical means for disguising between heavy and light loaded roadways
wim sensor technology
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
slide28

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***

slide30
TMAS

Products

  • System wide Vehicle weight by vehicle class
  • Axle Load Distribution
  • Equivalent Single Axle Load (ESAL)
  • Day-of-Week and Seasonal Patterns
w tables tws
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/

slide36

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.)

slide37

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.)

slide38

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

slide39

Greater than 10M tons per year

5 to 10 M tons per year

Less than 5 M tons per year

data quality act
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

data quality elements
Data Quality Elements
  • Data collection
  • Data Processing
  • Process improvement
  • Implementation plan
  • Data quality program.
slide45

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
slide46

Travel Monitoring Analysis System

  • Traffic Volume Trends
  • GIS
  • Freight Management
  • Safety

“THE EASY BUTTON”

session 6b summary
Session 6B Summary
  • Truck Weight User Needs?
  • Truck Weight Program Components?
  • Submittal Requirements?
  • Data Quality?
  • Truck Weight Data Reports?
questions
Questions
  • What questions do you still have about the Traffic Monitoring Program?
  • Expectations met?
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