Enforcement Procedures Using Weigh-in-Motion Systems in Indiana Darcy Bullock, P.E. Purdue University Andrew Nichols Purdue University Lt. Guy Boruff Indiana State Police Mark Newland INDOT Jason Wasson, P.E.INDOT

Presentation Perspective This presentation is going to cover the Indiana Virtual Weigh Station. We put this presentation forth to stimulate discussion that may lead to a consensus straw man for deploying additional sites along the GCM corridor in Illinois and Wisconsin

Virtual Weigh Station Project Virtual Weigh Station Project initiated by INDOT and Purdue in 2000 Objective: ISP Commercial Vehicle Enforcement mobile units can pull up to WIM site and connect wirelessly to cabinet to see real-time truck weight data The WIM reading is used to screen vehicles to be pulled over and weighed with certified portable scales

Background INDOT currently has ~42 installed WIM sites WIMs originally installed as Strategic Highway Research Project and Long Term Pavement Performance Project sites to collect continuous vehicle data to be used for research, design and planning Indiana State Police wanted a method for using the WIMs for dynamic weight limit enforcement efforts

I 80/94 – Day of Week EB Eastbound WIM Class 9 Volume GVW > 80k January 16 – March 31, 2002

I 80/94 – Hour of Day EB Eastbound WIM Class 9 Volume GVW > 80k January 16 – March 31, 2002

First Pilot run, observers standing in bushes radioing weights downstream manually August 10, 2000 WIM Reading 112,340 Portable Scales 111,350 Legal ~73,280 (short trailer)

I-65 Merrillville

N Sensors close-up

Single Load Cell WIM Upstream Loop Downstream Loop Load Cells Piezo Speed  Upstream Loop and Downstream Loop Weight  Load cell for each wheel Axle Spacing  Piezoelectric strip detects axles

I-65 Merrillville Equipment Cabinet Antenna

Merrillville WIM Cabinet 2 PCs in equipment cabinet 1 for NB system 1 for SB system Modem Panel

VWS Field Installed Hardware Antenna Mounted adjacent to cabinet Modem Panel Mounted inside cabinet

VWS Data Flow 90,000 lb

VWS Vehicle Hardware The cables, antenna, and modem fit inside the portable case to protect equipment when not being used.

VWS Vehicle Hardware Laptop located in police cruiser with software installed Protective case holds modem and antenna can be passed from car to car 900 Mhz radio modem MagMount Antenna

ISP/CVED Vehicle Setup Laptop Docking Station Printer CB

VWS Software Data for last vehicle crossing WIM Violator Data Summary data for all vehicles crossing WIM while software is active

Virtual Weigh Station Video

Current Status Radio equipment currently installed in 2 INDOT WIM cabinets I-65 Merrillville US 24 Fort Wayne ISP has 4 radio units to use during enforcement efforts

SR 24 Ft Wayne

WIM Cabinet SR 24

SR 24 Ft Wayne Truck Pulloff Area

Certified Portable Scales

SR 24 Ft Wayne Data Over GVW & Tandem $1169 Warning Over GVW Westbound WIM Over GVW & Tandem $1099 Over GVW & Axle $1189

SR 24 Ft Wayne Data Eastbound WIM Over Tandem $129 Warning Over Axle Warning Over GVW

I-65 Merrillville Data

I-74 Covington Data

VWS Photo WIM in Dover, IN Joint effort between ISP, INDOT, Mettler- Toledo and Purdue First Mettler-Toledo system used by us (others are by IRD) Installed on SR 1 in southeast Indiana – 2 lane road with high truck volumes between I- 74 & I-275 Objective – record picture of overweight truck at WIM and transmit image to vehicle parked down stream

SR 1 Photo Dover

N

SR 1 Photo WIM Pictures 1 st Picture Shows Violation 2 nd Picture Shows USDOT #

SR 1 Photo WIM Overlay

USDOT Number

SR 1 Performance (Nov 11,02)

SR 1 Status Strong support of the project by Mettler-Toledo to develop prototype image capturing capability. Site is currently not lighted, lighting would obviously improve performance but that perhaps could lead to some issues with adjacent residents. These performance figures reported are very promising, but should only be viewed as work in progress and will likely significantly improve in the coming months. This is not analogous to red-light cameras as these weights are not appropriate for enforcement.

Overall Project Status When using WIM for enforcement, enforcement personnel desire more accuracy then traditional required for performance monitoring. Purdue is logging data from all Indiana WIM sites and conducting large scale analysis of SQL database (several million records/month) In the process of creating online reports on various sites for ISP enforcement scheduling purposes Developing Statistical Process Control procedures for detecting calibration drift and other equipment errors sooner.

QC – Difference in Tandem Axle Weights Difference between closely spaced tandem axles For Class 9, 2 nd and 3 rd OR 4 th and 5 th axles

QC – Tandem Axle Spacing Spacing of tandem axles For Class 9, 2 nd and 3 rd OR 4 th and 5 th axles 2 nd and 3 rd axle spacing have very low variation

Virtual Weigh Station Video

Questions Darcy Bullock, P.E. Professor Purdue University School of Civil Engineering West Lafayette, IN