weigh in motion on the illinois tollwaypresented by msgt. steven legrand and michel lavigne on...

WEIGH‐IN‐MOTION ON THE ILLINOIS TOLLWAY

October 16, 2019

Master Sgt. Steven LeGrand, Illinois State Police District 15Michel Lavigne, Illinois Tollway GEC

Welcome and introductions…

Overview of WIM technology…

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Reduces overweight vehicle traffic

Increases pavement life

Data gathered assists with future pavement designs and enforcement

Uses sensor inputs to calculate• Classification• Weights • Speed • Vehicle length

Presented by MSgt. Steven LeGrand and Michel Lavigne on October 16, 2019

PURPOSE OF WEIGH ‐ IN ‐MOTION

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With axle spacing and weight the WIM is able to determine vehicle’s classification.

Definition

• WIM system is the process of measuring the dynamic tire forces of a moving vehicle and estimating the corresponding tire loads of the static vehicle

• Provides vehicle count, classification and speed in addition to weight

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EXISTING AND PROPOSED LOCATIONS

Presented by MSgt. Steven LeGrand and Michel Lavigne on October 16, 2019 3

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8b910

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Advantages• Installed by saw cuts only • Plate can be removed and replaced

Disadvantages• Cavity below bending plate must be cleaned annually to prevent drain clogging

• Components require annual maintenance and calibration


TECHNOLOGYBENDING PLATE

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Reducing road surface degradation around the plate.

Meets ATSM 1318 Type III for accuracy (GVW±6 percent).

Bad installation can create premature pavement degradation.

Salt corrosion of metallic parts.

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TECHNOLOGYQUARTZ SENSORS


Advantages• Embedded in pre‐cast concrete slab • Can be replaced with minimum saw cut

Disadvantages• Five‐year maximum longevity

Graphic Source: FHWA

Meets ATSM 1318 Type III for accuracy (GVW±6 percent).

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TECHNOLOGYPRECAST


Precast installation on the Northbound Tri‐State Tollway (I‐294/I‐80) just north of the Chicago Southland Lincoln Oasis

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TECHNOLOGYS ITE SELECTION CRITERIA


• High‐volume truck zone preferable

• Weigh‐in‐motion systems must be located upstream of a safe location to pull over trucks

• Straight, smooth and level existing pavement

• Close proximity to power and communication infrastructure

Jane Addams Memorial Tollway (I‐90) at Beverly Road WIM

Example: crash investigations sites and mainline toll plazas.

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FACTORS AFFECTING TECHNOLOGY SELECTION

• Reliability of ITS components• Locations that allow successful installation• Array of sensors to be installed• Sensitivity of sensors

• Temperature, vehicle dynamics, traffic volume, speed

• Resilience of sensor installation• Calibration frequency and accuracy of readings

• Life span of sensors and other components

• Life‐cycle costs – components, operations and maintenance, vendor support


Functional Performance Requirements for WIM Systems

*Includes single or dual tires Source: FHWA

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TECHNOLOGY EVALUATION

Standardizing deployment

Minimizing operations and maintenance costs

Minimizing risk of failure


Lane Unidirectional Bending Plate – Staggered Configuration

Source: FHWA

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SELF ‐CALIBRATING

Actual weights are entered into the program by the user, who calibrates weigh‐in‐motion system

Reduces amount of maintenance/calibration required

• Weigh‐in‐motion is officially recalibrated annually, along with quarterly maintenance


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SELF ‐CALIBRATINGRESULTS


Steer Drive Trailer GVW Steer Drive Trailer GVW

1 3.2% 6.5% 2.8% 4.4% ‐2.4% ‐1.0% ‐0.6% ‐1.1%

2 4.8% 4.2% 3.1% 3.9% ‐1.6% ‐2.6% ‐1.2% ‐1.9%

3 3.2% 3.9% 5.9% 4.6% ‐3.2% ‐1.3% ‐1.9% ‐1.9%

4 4.8% 5.2% 1.9% 3.7% ‐4.0% ‐1.3% ‐2.8% ‐2.4%

5 4.8% 3.6% 4.3% 4.1% ‐3.2% ‐0.3% ‐2.5% ‐1.7%

6 4.8% 5.2% 5.3% 5.2% ‐3.2% ‐2.3% ‐2.5% ‐2.5%

7 4.8% 4.2% 1.9% 3.3% ‐2.4% 1.3% ‐2.8% ‐1.1%

8 3.2% 4.9% 1.9% 3.3% ‐6.5% ‐6.2% 1.5% ‐2.9%

9 3.2% 3.9% 2.5% 3.2% ‐4.0% ‐1.3% 0.9% ‐0.8%

10 2.4% 3.3% 4.3% 3.6% 1.6% ‐2.0% ‐2.8% ‐1.7%

Average 4.0% 4.5% 3.4% 3.9% ‐2.9% ‐1.7% ‐1.5% ‐1.8%

Run

Piezo Quartz Error

Before Calibration

Piezo Quartz Error

After Calibration

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TESTING NEW TECHNOLOGIES

Tire Anomaly Classification System• Tire anomalies and flat tires• Potential safety issues with vehicleimbalance and improper load distribution

• Pilot project planned on Veterans Memorial Tollway (I‐355) weigh‐in‐motion rebuild

• Easily integrated with existing weigh‐in‐motion


• Decreases directional control

• Increases the risk of catastrophic failure

• Negatively impacts tire life and fuel economy

Mismatched and missing tires result in vehicle imbalance and improper load distribution

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TESTING NEW TECHNOLOGIES

Illinois Department of Transportation installed six TACS statewide since 2017, operated by the Illinois State Police


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TESTING NEW TECHNOLOGIESBR IDGE WEIGH ‐ IN ‐MOTION


Testing west of the Tri‐State Tollway(I‐294/I‐80) WIM

• Not used for enforcement• Proximity to WIM allows for system checks

Veterans Memorial Tollway (I‐355) WIM scheduled for repair

• >10‐year expected life• Upgrade will use the same technology as the

Tri‐State Tollway (I‐294/I‐80) install

Reagan Memorial Tollway (I‐88) WIM being studied in conjunction with Aurora Toll Plaza

I‐355 scheduled to be upgraded with tire anomaly sensor (spring 2020)

Thornton Quarry Bridge on the Tri‐State Tollway (I‐294/I‐80)

• Places sensors on steel beams, reads deflection on them and returns a projected weight of vehicle

• Non-invasive, since it is not in the pavement

Not accurate enough today

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WEIGH ‐ IN ‐MOTION ENFORCEMENT

Master Sgt. Steven LeGrand, Illinois State Police


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Infrastructure protection• Increases pavement life

Improves road safety by removing overloaded trucks

• Reduces amount of tire debris, which causes accidents and vehicle damage

• The Federal Motor Carrier Safety Administration has shown large truck and bus crashes are directly proportional to vehicle weight


OVERWEIGHT ENFORCEMENT RESULTS

Overloaded trucks are at an increased risk of accidents due to the steering and handling characteristics being altered by excess weight, reduced braking capabilities.

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IDEAL CONDITIONS FOR ENFORCEMENT


Permanent scales provide ideal locations for weighing trucks off the main roadway

The locations contain parking areas for commercial vehicle enforcement.

Due to the large area needed to accommodate the scales, locations are limited.

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ENFORCEMENT PAD


Parking on the roadway or on the shoulder is dangerous

Off‐roadway parking is ideal for enforcement

Original Veterans Memorial Tollway (I‐355) site required ISP troopers to park next to the weigh‐in‐motion cabinet

The WIM cabinet provided a series of lights that indicated a possible overweight truck.

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Located at Hillside (M‐2) maintenance site

First permanent scale in history of the Illinois Tollway/Illinois State Police District 15


PERMANENT SCALE

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ISP troopers look for the following signs of an overweight truck in order to conduct enforcement: • Bulging tires• Trucks accelerating slowly or having trouble stopping• Improperly loaded/leaning trailer, carrying large/heavy machinery, etc.

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WEIGH ‐ IN ‐MOTION DISPLAY


Weighs vehicles at highway speeds

Collects data on vehicles for the Tollway Engineering Department and for statistical purposes

The main function is to assist ISP with enforcing weight requirements for commercial vehicles in Illinois.

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WEIGH ‐ IN ‐MOTION AT TRI ‐STATE TOLLWAY ( I‐294/I‐80) CHICAGO SOUTHLAND L INCOLN OASIS


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Provides weights and photos to Illinois State Police laptops in real‐time

Troopers can park anywhere safely downstream, monitor weigh‐in‐motion via laptop and conduct enforcement

Current technology ensures an error rate of +/‐ 10 percentPresented by MSgt. Steven LeGrand and Michel Lavigne on October 16, 2019

TRUCK TRACKING SOFTWARE

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However, we are currently around 5-7 percent error rate and with frequent calibrations expect that to go down to 5 percent.

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ENFORCEMENT


Weigh‐in‐motion data can only be used for detection – not enforcement

Must use scales certified by the Illinois Department of Agriculture

Permanent scale or wheel‐load weighing can be used

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VIRTUAL WEIGH STAT ION SOFTWAREVEHICLE RECORD DETAILS AND PHOTO DISPLAY


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I N S ERT WHEE L LOAD WE IGH ING I N ACT ION V IDEO


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WEIGH ‐ IN AREAS


Provided to protect troopers• Manual side of Spring Creek Toll Plaza• Crash investigation sites (with guardrail protection)

• Hillside (M2) maintenance site permanent scale

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JANE ADDAMS MEMORIAL TOLLWAY ( I ‐90) CRASH INVESTIGATION SITE


Allows for safe weighing and inspection

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QUESTIONS?

Master Sgt. Steven [email protected]

Michel [email protected]


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THANK YOU

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weigh in motion on the illinois tollwaypresented by msgt. steven legrand and michel lavigne on...

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