Many things have been said around the accuracy of Cestel’s SiWIM® B-WIM system. And yet again, SiWIM® has proven itself as a strong and fierceful contender as the leading researchers on B-WIM from Auburn University have confirmed its accuracy to be more than comparable with other methods of data collection.
In road and bridge design and evaluation, traffic load spectrum is very important. As the static methods are selective and measure only a small fraction of the traffic, the Weigh-in-Motion measuerements provide for continuous recording of all the traffic. Furthermore, B-WIM systems, such as Slovenian SiWIM® system represent an innovative, non-destrictive and highly accurate approach to data collection, while at the same time displaying the realistic response of the structure.
Approximately 150, class 90, 5-axle vehicles were measured. Initially the truck passed through the ALDOT WIM station; then it was measured using the static scales. Afterwards the Alabama State Troopers weighed the vehicle using the portable scales, one axle at a time. Finally, the vehicle was measured by the Cestel’s SiWIM® system located on a bridge in Alabama.
As said, SiWIM® can provide for the largest number of parameters, including GVW, individual and tandem axle weights, spacing between them, vehicle speed and classification. Furthermore, as observed in the table above, Dr. Andy Nowak, one of the leading researchers on B-WIM and his team of experts, have proven that results obtained from SiWIM® system are remarkably close to the accurate but cumbersome portable scales.
Based on this study, two major conclusions can be made. Firstly, truck weight stations provide accurate results but they are expensive to operate and illegally overloaded traffic can find alternative routes and avoid consequences. And secondly, Cestel’s SiWIM® system provides accurate results as the mean values and standard deviation are the same as the results of the certified portable scales. CDF’s of GVW, W4, W5, AG1, AG2 are the same as for the results of the certified portable scales.
Thus, portable and easy to apply SiWIM® BWIM provides highly accurate measurements and data. Its accuracy is adequate and compares succesfully with WIM stations, static scales and most notably to portable scales.
Special thanks and acknowledgements to Dr. Andy Nowak and his team of experts. Whole research can be found by clicking here.
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Over 500 law enforcement personnel, government officials, and industry professionals convened in Atlanta, GA April 24-27 for the 2017 Commercial Vehicle Safety Alliance Conference (CVSA). Among the many topics discussed were; Post Accident Reporting, Cargo Securement, International Fuel Tax Agreement (IFTA), and Electronic Logging Devices (ELD's) which was enacted by the United States Congress in 2012. Fleets have until December 2017 to implement certified ELD,s.
