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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
Pavement Design / Maintenance Bridge Design / Loading Enforcement Research Taxation & Administration Freight Planning Data Users
Truck Weight Program Products Components Structure
Products Gross Vehicle Weights (GVW) Axle Load Distribution Equivalent Standard Axle Load (ESAL) Day-of-Week and Seasonal Patterns
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
Structure of Vehicle Weight Program Continuous Count Program Short Term Count Program
Continuous Count Program Purpose? How many? Locations?
Purpose Temporal distribution Hourly Day-of-week Seasonal Direction Axle adjustment factor Freight studies
How many? Supplement ATR program Truck corridors
Short Term Count Program Purpose? Segments? Cycles? Duration? Factors?
Purpose? Spatial distribution (geographical) Comprehensive Foundation for AADTT Axle adjustment factors
Segments? Homogeneous truck traffic section Usually longer than volume segments Not always Between Intersections Roadways Interchanges
Cycles? Quarterly Yearly 2 Years 3 Years (TMG) TMG (obsolescence )
Durations? 24 Hr 48 Hr (TMG) 72 Hr 7 - days
Types of Weighing Static Weighing Weight-in-Motion
Static Weighing Advantages Accurate weight and dimensions Permanent scales Disadvantages Time consuming Safe site Resource intensive
Picture of Static Weighing
Weigh-in-Motion (WIM) Advantages More vehicle weighed Better coverage Unbiased sample Disadvantages Higher installation costs Higher equipment and maintenance costs Fixed locations
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
Picture of Load Cell WIM System
Picture of Bending Plate WIM System
Picture of Piezo-Ceramic WIM System
Picture of Capacitance Mat WIM System
Picture of Capacitance Strip WIM System
Picture of Bridge WIM System With Strain Gauges
WIM Calibration Calibration Issues Actual vs. WIM Test truck and random truck Auto-calibration and re-calibration Front Axle Temperature
Reference Materials WIM Handbook ASTM WIM Standard Long Term Pavement Performance
Software and Reports Vehicle Travel information System (VTRIS) Truck Weight Study (TWS)
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
VTRIS Products System wide weight and ESAL’s values Vehicle weight by vehicle class Weight distribution
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
Summary Truck weight User Needs Truck Weight Program WIM Issues Truck Weight Data Reports
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