Presentation on theme: "Using GPS to Track Pole Truck Turning Movements"— Presentation transcript:
1 Using GPS to Track Pole Truck Turning Movements Presented by:John Wolf, PESenior DesignerODOT, Region 1 Preliminary Design&Ron Singh, PLSChief of Surveys/Geometronics ManagerODOT, Technical Services
2 The Problem Intersection at Bennett Road & US 30 High volume, multilane highway3 Crashes in 2008 involving passenger cars and log trucks2 injuries and 1 fatality resultedPermitting issue regarding overhang on long loadsMaximum Overhang was dependant on wheelbase and trailer typeOverhang was measured from rear axlePole trucks need access to pole yard
7 The Challenges Timing was critical Motor Carrier issued a pilot car requirement on log trucks with large overhang, effective 9/12/08, for over 260 permit holdersVariable vehicle configurations (What should be analyzed?)Pivoting trailer bunks influence log sweep pathTurning movement software limitations?The need to applying the turning movements to multiple situationsMultiple intersection configurationsFreeway ramp terminalsMultilane Roads
8 Unique Elements of A Pole Truck Long WheelbaseLarge OverhangRear Bunk/Pivot PointFront Bunk/Pivot PointAdjustable Stinger Hitch and Compensator
9 Extendable Stinger12’6” Total Length5’6” Available AdjustmentCompensatorVehicle #2
11 AutoTURN v5.1AutoTURN is a CAD-based program that simulates low speed turning maneuvers for highway vehiclesVehicle inputsDefault vehicle configurationsUser defined vehicle configurationsInputs include number of axles, axle spacing, tractor/trailer length, and distance to pintle hitchLimitationsAutoTURN v5.1 does not account for adjustable length “stinger” pintle hitchTurning accuracy for this type of tractor/trailer uncertain
12 AutoTURN Inputs Default truck templates Modified pole truck templates Critical measurements include bumper, axle spacing, hitch location, axle location, bunk location, overhang, front of loadModified pole truck templates
14 Course of ActionCollected data from ODOT Motor Carrier on common pole truck configurationsResearch other turning simulator softwareODOT Maintenance staff coordinated field testing of two pole trucks using GPS tracking dataNote: ODOT Motor Carrier Division also collected data on accident history of pole trucks on Oregon highways and neighboring states log truck permitting requirementsInvestigated older versions of AutoTURN as well as a log truck turning software developed by the forestry service.
23 GPS Devices12’ Between Cones5’5’5’5’5’Ribbons Spaced at 5’ Intervals From Rear BunkTest Vehicle #212’ Between ConesCones Offset 2’ from Path for Driver’s Side Front Tire
24 After Data CollectionCreate vehicle configurations to replicate field testRun AutoTURN analysisCompare resultsRun sensitivity analysis of sweep path based on overhang lengthReport Results to Motor Carrier and the Trucking Industry
29 Comparison of Field Tests to AutoTURN – Vehicle #1
30 Comparison of Field Tests to AutoTURN – Vehicle #2
31 General Findings of Field Test and Analysis Sweep path is dependent on vehicle configuration and length of overhang from the rear bunkSweep path is the same for both left and right turnsAutoTURN v 5.1 reasonably predicts pole truck turning movements for various conditionsPath generated using AutoTURN v 5.1 predicted log sweep within 2’ for Vehicle #1 and 1’ for Vehicle #2 compared to GPSAutoTURN's maximum error in the trailer off tracking was between ½’ and 2’ (2’ occurred as the vehicle exits the curve)Multiple curves compound the error in the AutoTURN software
32 OutcomesODOT Motor Carrier changed permitting requirements for overhang, effective 11/24/2008Length of overhang was limited to 1/3 Wheelbase with a 25’ maximum for multilane roadsChanged the point which overhang is measured fromLifted the temporary pilot car restriction for vehicles meeting these requirementsRequirements are posted at:Currently investigating an intersection improvement project at US 30 and Bennett Road to better accommodate pole trucks
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