Traffic Monitoring Guide Truck Weight Monitoring Section 5.

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Presentation transcript:

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

Products

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:

Summary Truck weight User Needs Truck Weight Program WIM Issues Truck Weight Data Reports