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ROLLOVER WARNING!! Truck Roll Stability Data Collection and Analysis. Tykey Truett Center for Transportation Analysis Oak Ridge National Laboratory (865)574-4225 or LFT@ornl.gov. Objectives. Collect and analyze vehicle and highway data relevant to the problem of truck rollover crashes
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ROLLOVER WARNING!!Truck Roll StabilityData Collection and Analysis Tykey Truett Center for Transportation Analysis Oak Ridge National Laboratory (865)574-4225 or LFT@ornl.gov
Objectives • Collect and analyze vehicle and highway data relevant to the problem of truck rollover crashes • Evaluate the performance of the equipment used to collect the data
Project Partners • FHWA/FMCSA • Oak Ridge National Laboratory • U.S. Xpress Enterprises • Praxair • Volvo Trucks of North America • Wabash National Corporation • Control by Light (formerly of Raytheon) • Tennessee DOT
GPS Data Speed RPM Odometer Strain (weight transfer) Ambient Air Temp Weight on Rear Axle Lateral Acceleration Longitudinal Acceleration Types of Data Collected
Data Management and Analysis • In trucks, logged to a file and saved to a memory card • Transferred to ORNL server via FTP • Validated and saved to databases • Characterized using a statistical tool and spreadsheet • Mapped using a GIS tool • Overlaid on satellite photo images
Synopsis of Data Files • Ten files received between 6/6/00 and 1/25/01 • Files ranged from 499 kB to 160,407 kB • Some had trailer readings; others did not • Some had date in file; others did not • Early data files were collected prior to May 1, 2000
Summary • Using trucks in revenue service, data were collected from both trucks and trailers • Both box trailers and tankers were used • The equipment used for data collection on the vehicle was evaluated • The data were analyzed for accuracy, timeliness, and applicability for a truck warning system
Equipment Evaluation • Trailer-to-tractor communication was a problem and led to missing trailer data • Connectors on the on-board computer and attached devices caused intermittent data logging • Lack of proper shut-down procedures on the tractor PC eventually caused operating system failure
Data Accuracy and Timeliness • GPS data can provide very accurate real- time vehicle position • Analysis of limited data sets indicate: • Instrument drift and temperature can be estimated • Measured lateral acceleration and weight transfer are reasonable and correlated • Trailer data can be used to indicate roll stability • “Bad curve” database can be generated
Conclusions • Data collected by the tractor and trailer can be used effectively to provide a dependable, reliable, and timely rollover warning system for truck drivers • Such a warning system would not require expensive roadside beacons