PORTABLE WEIGH-IN-MOTION FIELD EVALUATION. Minnesota Local Road Research Board
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1 PORTABLE WEIGH-IN-MOTION FIELD EVALUATION Minnesota Local Road Research Board 11/24/
2 Acknowledgments 2 LRRB: Joe Triplett, Chisago County MnDOT Technical Liaison: Ben Timerson MnDOT ORS Project Coordinator: Nelson Cruz
3 Background 3 Existing WIM technologies are permanent, expensive, and intrusive. Portable Weigh-in-Motion (PWIM) offers cost-effective means for Gross Vehicle Weight (GVW) data collection at various locations. Prototype system allows for software modifications to match data collection needs.
4 Project Goals 4 1. Evaluate System Installation/Removal Process & Procedures A. Implement/Evaluate suggested installation/removal procedure under varying environmental conditions B. Evaluate required resources for installation and opportunities for efficiency C. Evaluate safety considerations and traffic control requirements D. Identify maximum duration for system deployment
5 Project Goals 5 2. Determine System Performance A. Determine appropriate calibration procedure and identify proper data sets for baseline comparison B. Determine procedure for a high-level accuracy check C. Test/Troubleshoot system to resolve unanticipated prototype issues
6 Project Goals 6 3. Analyze Data & Evaluate System Accuracy A. Document ease of data collection B. Review & compare data to baseline C. Evaluate data accuracy D. Evaluate system potential as new means of data collection
7 Test Locations Phase 1 (2013) 7 ATR 228 ATR 231 ATR 232 ATR 407 ATR 229 ATR 233 ATR 230 ATR County Closest City 233 Sibley Arlington 229 McLeod Hutchinson 230 Rice Lonsdale 407 Hennepin Orono 232 Grant Norcross 231 Wadena Nimrod 228 Itasca Hibbing Location CSAH 9, 0.7 MI N OF 226TH ST, N OF ARLINGTON CSAH 18, 4.3 MI W OF CSAH7, SW OF HUTCHINSON CSAH 2, 3.4 MI W OF TH19, W OF LONSDALE CSAH 15, NE OF SPATES AVE IN ORONO CSAH 11, 0.6 MI S OF CSAH12, NE OF NORCROSS CSAH 12, 1.6 MI E OF CSAH18, E OF NIMROD CSAH 7, N OF CR339, W OF HIBBING
8 Test Locations Phase 2 (2014) 8 Site Number Closest City 1 Nessel Twp Location CSAH 2 between County Line & CSAH 4 2 Harris CSAH 30 south of CR 59 Site 1 3 Harris CSAH 10 between CR 65 & CR 64 Site 3 Site 2 4 Harris CSAH 10 between I-35 & CSAH 30 Site 4 5 Harris 6 Stacy 7 Chisago City 8 Fraconia Twp CSAH 30 between 415th St. & CSAH 10 CSAH 30 between CSAH 19 & CSAH 30 CSAH 24 between Stinson Ave & CSAH 23 CSAH 25 between CSAH 23 & CR 86 Site 5 Site 7 Site 6 Site 8 Site 9 Site 10 9 Fraconia Twp CSAH 26 between TH 8 & CSAH Fraconia Twp CSAH 26 between CSAH 21 & TH 95
9 System Overview 9 Data Capabilities: - Volume - Speed - Axle Spacing - Axle Spacing-based Classification - Weight-based Classification - Individual Axle Weights - Gross Vehicle Weight
10 System Installation/Removal 10 Typical installation/removal requires two people approximately 30 minutes. Single lane closure flagging operation. Materials Required: Materials Quantity Equipment Duct Tape Rolls (Gorilla Brand) Sleeve Anchor Screws Industrial Strength Drill Bit 4 Hammer 30 Drill 1 Generator/Source of Power Washers 30 Broom
11 System Calibration 11 Several settings are configurable in the system software. Standard weight calibration procedure was developed during Phase 2 using different vehicle types: - Pick-up Truck (5 kips) - County Dump Trucks (25 kips) - County Maintenance Vehicles (100 kips) - MnROAD Calibration Truck (80 kips)
12 Data Results 12 Average Percent Difference from Baseline: - Volume ATR (Phase 1) = 22.0% ATR (Phase 2) = 3.3% Traffic Tubes = 13.6% - Speed ATR (Phase 1) = 1.3% ATR (Phase 2) = 0.9% Traffic Tubes = 3.6% Vehicle Count Vehicle Count ATR WIM (Weight-Based) WIM (Axle Spacing-Based) Class Tube WIM (Weight-Based) WIM (Axle Spacing-Based) Class
13 Accuracy Results - Pickup 13 Actual GVW 5.16 kips Pick-up Truck Actual GVW: 5.16 Average GVW: 4.74 Standard Deviation: 1.20 Average % Error: 8.14% 6% Accuracy Shaded Area 15% Accuracy Shaded Area
14 Accuracy Results Overloaded Semi 14 Actual GVW kips County Truck Actual GVW: Average GVW: Standard Deviation: 8.71 Average % Error: 4.02% 6% Accuracy Shaded Area 15% Accuracy Shaded Area
15 Accuracy Results 80 kip semi (MnROAD) 15 Actual GVW kips MnROAD Truck Actual GVW: Average GVW: Standard Deviation: 5.30 Average % Error: 3.94% 6% Accuracy Shaded Area 15% Accuracy Shaded Area
16 Evaluation Results 16 ASTM E Standard Specifications for Highway WIM Systems Percent of calibration runs that fell within the ASTM WIM standards: Accuracy Standard Half-Ton Pickup Class 6 Dump Truck Class 9 (MnROAD) Truck ASTM Type II 15% 56% 90% 93% ASTM Type III 6% 24% 49% 58%
17 Lessons Learned 17 Install system under optimal conditions sunny & dry. 48-hour maximum data collection periods. Extra tape! Vandalism is a threat.
18 Lessons Learned 18 Many software revisions. PWIM Prototype 2.0 hardware improvements. Designed for rural deployments not good with excessive traffic. Estimated pad useful life of installations.
19 Next Steps 19 Outreach to counties promoting system data collection capabilities improve pavement design
20 20 Final Report
21 Contact 21 Scott Petersen, P.E., SRF Consulting Group - spetersen@srfconsulting.com, Ben Timerson, P.E., MnDOT Office of Transportation System Management - benjamin.timerson@state.mn.us,
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