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Book Evaluation of the Reliability and Methods of Calibration of Weigh in Motion System

Download or read book Evaluation of the Reliability and Methods of Calibration of Weigh in Motion System written by Richard M. Michaels and published by . This book was released on 1990 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book High Speed Weigh in motion System Calibration Practices

Download or read book High Speed Weigh in motion System Calibration Practices written by A. T. Papagiannakis and published by Transportation Research Board. This book was released on 2008 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Portable Weigh in motion System Evaluation

Download or read book Portable Weigh in motion System Evaluation written by and published by . This book was released on 2015 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Minnesota Local Road Research Board, MnDOT, and SRF performed an evaluation of a portable weigh-inmotion (WIM) system at several locations throughout Minnesota. The system was developed at the University of Minnesota-Duluth and offers roadway designers a low-cost method for obtaining vehicle load distribution data across the state's road network. To deploy the system, the weigh pads of the system were temporarily affixed sensors across the roadway lanes. As vehicles passed over the weigh pads, pressure sensors within the pads detected the weight of vehicles and the system recorded the data for later analysis. Traditional methods for travel monitoring generate traffic volume and classification data, but weigh-in-motion systems give designers a more accurate idea of current and projected traffic loading demands. SRF's testing provided implementation refinements that were incorporated into the system. During the two-year deployment process, the portable WIM system was installed under a wide array of environmental conditions to demonstrate the system's capabilities. Data generated by the system was analyzed. The Final Report details system deployment, calibration, and system accuracy.

Book Calibration of Weigh in motion Systems

Download or read book Calibration of Weigh in motion Systems written by J. M. Zuieback and published by . This book was released on 1988 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book ICWIM 5 Proceedings of the International Conference on Heavy Vehicles

Download or read book ICWIM 5 Proceedings of the International Conference on Heavy Vehicles written by Bernard Jacob and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weigh-in-motion (WIM) is a process of measuring the dynamic tire forces of a moving vehicle and estimating the corresponding tire loads of the static vehicle. This collection of lectures from the International Conference on Weigh-in-Motion details applications such as: collection of statistical traffic data, support of commercial vehicle enforcement, roadway and bridge cost allocation, and traffic management.

Book The Evaluation and Calibration of Weigh in motion Systems

Download or read book The Evaluation and Calibration of Weigh in motion Systems written by Kevin Andrew Senn and published by . This book was released on 1995 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Proposed Method of Calibration and Correlation of Weigh in Motion Systems

Download or read book A Proposed Method of Calibration and Correlation of Weigh in Motion Systems written by David L. Allen (Transportation Engineer) and published by . This book was released on 1996 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Wim Sensors Accuracy Guidelines for Equipment Selection and Calibration and Traffic Loading Data Applications

Download or read book Wim Sensors Accuracy Guidelines for Equipment Selection and Calibration and Traffic Loading Data Applications written by Muhammad Munum Masud and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weigh-in-Motion (WIM) technology is one of the primary tools used for pavement management. It can provide essential and accurate truck traffic information, including vehicle class and speed, vehicle count, gross vehicle weight (GVW), single axle (SA) and tandem axle (TA) weights, axle spacing, and the date and time of the event. The State Departments of Transportation (DOTs) gather WIM data for various applications, including highway planning, pavement and bridge design, commercial vehicle weight enforcement, asset management, and freight planning and logistics. Overloaded trucks pose severe challenges to road transport operations. Overloaded trucks can cause more damage to the pavement systems than trucks loaded within legal weight limits. Truck overloading can also lead to severe consequences if involved in a traffic accident. Law enforcement agencies divert potentially overloaded trucks to static scales and issue tickets based on the information collected at a WIM station. Because of the wide range of applications, the data obtained at WIM stations must be accurate, consistent, and reflect actual field conditions.This study addressed four critical concerns related to WIM equipment performance, calibration needs, traffic loading data quality, and applications. Precisely, the current research advanced the state of the practice knowledge about (a) potential factors impacting WIM system accuracy, (b) accuracy and consistency of traffic loading data and calibration needs of WIM stations, (c) revised/modified guidelines for WIM equipment calibration, and (d) estimation of commercial freight tonnage from Gross Vehicle Weight (GVW) data. The research objectives were accomplished by synthesizing and analyzing the WIM performance and traffic loading data available in the Long Term Pavement Performance (LTPP) traffic database and data available through other state DOTs. The WIM sites analyzed in this study are from 30 states within the United States and 3 Canadian provinces. Several factors can affect the WIM system accuracy (i.e., measurement error). The potential site-related factors include road geometry, pavement stiffness, surface distresses, roughness, and climate. Decision tree models were developed in this study to illustrate a potential for estimating the expected WIM measurement error range using information about the WIM site and sensor-related factors. The results show that the sensor array and sensor types are the most important predictors, followed by WIM controller functionality (speed points). The data analysis and results also show that the climate can be important for some sensor types. One can integrate this information with equipment installation and life cycle costs to determine the most reliable and economical WIM equipment while also considering accuracy requirements by WIM data users.One way to evaluate WIM measurement errors is by using the data collected immediately before and after equipment calibration. The limitation of this approach is that the data represent a snapshot in time and may not represent a long-term WIM site performance. Consequently, an alternative approach was needed to characterize temporal variations in WIM data consistency. This study presents a method to estimate WIM system accuracy based on axle load spectra attributes [Normalized Axle Load Spectra (NALS) shape factors]. This analysis's main objective is to determine WIM system errors based on axle loading without physically performing equipment calibration. Using NALS to estimate WIM system accuracy can save a significant amount of time and resources, usually spent on equipment calibrations yearly.Successful WIM equipment calibration can eliminate systematic weight, speed, and axle spacing errors. The suggested changes in current WIM calibration procedures related to truck type (loaded truck), number of truck runs, and truck speed (multiple speed points) can significantly reduce the time and resources needed for successful equipment calibration. Accurate freight tonnage estimates and trends are essential due to their implications on economic, infrastructure development, and transportation policy decision-making. This study presents a practical application of WIM data to estimate freight tonnage and classify commodity types. The payloads computed for Class 9 trucks from GVW data strongly correlated with the average freight tonnage obtained from a commercial data source, i.e., Transearch from the IHS market. The user can independently verify the freight estimates from surveys at locations close to WIM sites.

Book Evaluation of a Weigh in motion System

Download or read book Evaluation of a Weigh in motion System written by and published by . This book was released on 1989 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis presented in this paper deals with accuracy of a weigh-in-motion (WIM) system installed on the Trans Canada Highway west of Regina. Spot speed data collected by the WIM are compared with the measurements taken by a radar meter; the WIM data on axle spacing are compared with data obtained by manual measurements; and the dynamic weight data gathered by the WIM system are evaluated against static weights. The following conclusions can be made from this study : The WIM system under investigation provides accurate data for spot speed and axle spacing. The study data for eighty nine trucks indicate that the dynamic weights recorded by the WIM system may contain high magnitudes of both systematic and ramdom errors. However, the results of analysis presented suggest that a proper calibration of the system can reduce the systematic errors to a large extent. For the covering abstract of this Conference see IRRD abstract number 853851.

Book High Speed Weigh in Motion Calibration Practices

Download or read book High Speed Weigh in Motion Calibration Practices written by A. T. Papagiannakis and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper provides a summary of the weigh-in-motion (WIM) calibration practices used by state highway and load enforcement agencies in the United States. The detailed statistical data presented were collected through a web-based survey questionnaire. It covers three common WIM calibration practices, namely utilizing multiple passes of test trucks, utilizing traffic stream vehicles of known static weight, and employing only WIM data quality control (QC) techniques. To put the actual practice in perspective, an overview is provided of the current WIM calibration standard (ASTM E1318-02) and the new provisional standard for quantifying pavement roughness at the approach to WIM systems (AASHTO MP 14-05). Most agencies use a combination of two or more of these methods for WIM system calibration. The majority of agencies uses WIM data QC on a routine basis and they resort to one of the other two calibration methods when WIM data quality deteriorates. Test truck calibration typically involves one or two Class 9 trucks running at several speeds. Few of these agencies, however, perform actual pavement roughness measurements on the approach to the WIM sites. Agencies that use traffic stream vehicles of known static weight for WIM calibration obtain static weights manually using permanent static scales. The method involves up to 100 trucks selected by class, speed or both class and speed. Agencies use a variety of traffic elements and formulas for computing calibration factors. Similarly, a variety of traffic data element errors are computed and various approaches are used for computing calibration factors. In the light of these findings, the paper provides a number of recommendations for improving current WIM calibration practices.

Book Weigh in motion Systems Evaluation Final Report

Download or read book Weigh in motion Systems Evaluation Final Report written by James O. Burt and published by . This book was released on 1976 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: