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Author : Herbert Fletcher Southgate
Publisher :
ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (828 download)
Download or read book Quality Assurance of Weigh-in-motion Data written by Herbert Fletcher Southgate and published by . This book was released on 2001* with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.3/5 (91 download)
Download or read book Effective Use of Weigh-in-motion Data written by and published by . This book was released on 2007 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andrew P. Nichols
Publisher :
ISBN 13 : 9781622602063
Total Pages : pages
Book Rating : 4.6/5 (2 download)
Download or read book Quality Control Procedures for Weigh-In-Motion Data written by Andrew P. Nichols and published by . This book was released on 2004-06-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Weston Charles Ott
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (359 download)
Download or read book Weigh-in-motion Data Quality Assurance Based on 5-axle Tractor Semitrailer Truck Steering Axle Load Analysis written by Weston Charles Ott and published by . This book was released on 1995 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Olga I. Selezneva
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (18 download)
Download or read book Successful Practices in Weigh-in-motion Data Quality with WIM Guidebook written by Olga I. Selezneva and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arizona Department of Transportation (ADOT) plans to install new weigh‐in‐motion (WIM) stations with either piezo-polymer or piezo-quartz sensors. Recognizing some limitations of WIM sensor technologies, ADOT sponsored this study to ensure the accuracy of the future WIM data collection. The project tasks included (1) reviewing other highway agencies’ practices related to WIM data quality assurance through literature review and a survey; (2) developing a guidebook of clear recommendations for managing WIM installation, calibration, maintenance, and data quality assurance; and (3) developing a research report with recommendations on how to achieve successful implementation of a WIM program. Through reviewing available literature and surveying selected highway agencies, the project team determined that the piezo-quartz sensors perform much better than the piezo-polymer sensors due to their consistent reliability, reduced calibration requirements, and relative temperature insensitivity. With proper installation, piezo-quartz WIM sensors should provide accurate axle and truck weight measurements in Arizona. Findings also indicated that piezo-polymer sensors should perform well in Arizona for vehicle classification, traffic volume, and speed studies, but not for weight data collection. This is due to the temperature sensitivity of piezopolymer sensors and to the limitations of auto-calibration and temperature compensation technologies in environments where pavements undergo rapid day-to-night temperature changes and are subjected to high seasonal temperatures. Piezo-polymer sensor use with an auto-calibration feature for weight measurements should be evaluated on a case-by-case basis. Using findings from the literature review and the successful WIM practices survey, the research team developed a guidebook with recommendations and procedures for WIM site selection and qualification, installation, calibration, maintenance, data quality assurance, and personnel needed to support ADOT’s WIM program. These recommendations are specific to WIM systems that use piezo-quartz sensors and piezo-polymer sensors. The guidebook is included as Chapter 4 of this final report.
Author : A. T. Papagiannakis
Publisher : Transportation Research Board
ISBN 13 : 0309098157
Total Pages : 413 pages
Book Rating : 4.3/5 (9 download)
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:
Author : Wayne Bunnell
Publisher :
ISBN 13 : 9781622605033
Total Pages : pages
Book Rating : 4.6/5 (5 download)
Download or read book Implementation of Weight in Motion Data Quality Control and Real-Time Dashboard Development written by Wayne Bunnell and published by . This book was released on 2019-02 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: State agencies have implemented weigh-in-motion (WIM) sensors for years to assess and monitor various aspects of highway commercial motor vehicle traffic. This study analyzes 3.5 years of WIM data from 33 WIM sites provided by the Indiana Department of Transportation (INDOT) and compares systematic procedures to identify WIM locations with measurement errors. The following areas are examined: WIM accuracy and precision, class 9 front axle weight, left-right front axle residual, and impact of pavement smoothing on WIM performance. The statistical distribution of Class 9 truck's front axle weight as a performance metric is suggested for automated online software. This study also assessed the accuracy and precision of two WIM sites by direct comparison with weight data obtained at Indiana State Police certified weigh scales. A 5 month study on I-94 collected 564 static weights and found that 98% of the WIM weights were within ± 5% of the static weights. A second study on I-70 collected 262 static weights and found that 87% of the WIM weights were within ± 5% of the static weights after statistical adjustment.
Author : Chen-Fu Liao
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (89 download)
Download or read book Traffic Data Quality Verification and Sensor Calibration for Weigh-in-motion (WIM) Systems written by Chen-Fu Liao and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project aims to understand the characteristics of WIM measurements, identify different WIM operational modes, and develop mixture models for each operation period. Several statistical data analysis methodologies were explored to detect measurement drifts and support sensor calibration. A mixture modeling technique using Expectation Maximization (EM) algorithm and cumulative sum (CUSUM) methodologies were explored for data quality assurance. An adjusting CUSUM methodology was used to detect data anomaly. The results indicated that the adjusting CUSUM methodology was able to detect the sensor drifts. The CUSUM curves can trigger a potential drifting alert to the WIM manager. Further investigation was performed to compare the CUSUM deviation and the calibration adjustment. However, the analysis results did not indicate any relationship between the computed CUSUM deviation and the calibration adjustment.
Author : Mark E. Hallenbeck
Publisher : Transportation Research Board
ISBN 13 : 0309087880
Total Pages : 68 pages
Book Rating : 4.3/5 (9 download)
Download or read book Equipment for Collecting Traffic Load Data written by Mark E. Hallenbeck and published by Transportation Research Board. This book was released on 2004 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction -- Types of equipment -- Technology descriptions -- A process for selecting equipment -- Best practices for equipment use -- Abbreviations used without definitions in TRB publications.
Author : Jerry G. Pigman
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (918 download)
Download or read book WIM Data Collection and Analysis written by Jerry G. Pigman and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this study were to review and analyze current procedures in order to implement a process for collecting and analyzing weigh-in-motion (WIM) data to insure an adequate and accurate representation of weights of vehicles using Kentucky's roadways. A literature review of WIM data collection equipment, practices and procedures indicated that a range of options are available and used by other agencies. Piezoelectric cable detection systems were most frequently used and provided adequate accuracy, if attention is given to monitoring and calibration. An overall assessment of Kentucky's WIM data collection program resulted in recommendations for: 1) increased use of cell modems for more efficient data download, 2) attention to quality control of data with a routine program of polling sites and monitoring consistency of front-axle weights, 3) expansion of WIM data collection program to capture a wider range of functional class coverage of truck traffic, 4) attention to weight data collection on coal-hauling routes, 5) consideration of using static weigh station data to increase coverage of truck weight monitoring, 6) initiation of a data collection plan to capture sufficient data to develop length-based classification factors, 7) continued review and evaluation of new software that has the capability of increasing the efficiency and accuracy of WIM data processing, and 8) evaluation of the cost-effectiveness of expanded and accurate WIM data collection and the impact on pavement thickness designs.
Author : J.G. Pigman
Publisher :
ISBN 13 :
Total Pages : 49 pages
Book Rating : 4.:/5 (918 download)
Download or read book WIM Data Collection and Analysis written by J.G. Pigman and published by . This book was released on 2013 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this study were to review and analyze current procedures in order to implement a process for collecting and analyzing weigh-in-motion (WIM) data to insure an adequate and accurate representation of weights of vehicles using Kentucky's roadways. A literature review of WIM data collection equipment, practices and procedures indicated that a range of options are available and used by other agencies. Piezoelectric cable detection systems were most frequently used and provided adequate accuracy, if attention is given to monitoring and calibration. An overall assessment of Kentucky's WIM data collection program resulted in recommendations for: 1) increased use of cell modems for more efficient data download, 2) attention to quality control of data with a routine program of polling sites and monitoring consistency of front-axle weights, 3) expansion of WIM data collection program to capture a wider range of functional class coverage of truck traffic, 4) attention to weight data collection on coal-hauling routes, 5) consideration of using static weigh station data to increase coverage of truck weight monitoring, 6) initiation of a data collection plan to capture sufficient data to develop length-based classification factors, 7) continued review and evaluation of new software that has the capability of increasing the efficiency and accuracy of WIM data processing, and 8) evaluation of the cost-effectiveness of expanded and accurate WIM data collection and the impact on pavement thickness designs.
Download or read book Weigh in Motion Data Analysis written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: At hundreds of Weigh in Motion (WIM) stations, State Departments of Transportation collect traffic data every year to support pavement design, to enforce weight restrictions on highways and bridges, and to provide planning data for highway improvements. Reliable WIM data is particularly important to support the procedures in the FHWA Mechanistic Empirical Pavement Design Guide (MEPDG). The purpose of the research is to identify and resolve four related but relatively stand-alone problems associated with WIM data collected by NCDOT. Quality Control: After the NCDOT collects WIM data and converts it from proprietary vendor format to an ASCII text format, the quality of the data must be checked. During the quality control (QC) procedures, tests identify incomplete datasets, out of range values for individual vehicle classes, and other possible data problems. Vehicle class and weight checks generate 0.97% and 6.42% anomalies, respectively thus confirming that NCDOT equipment captured reliable WIM measurements. NC Urban and Rural Truck Traffic Profiles: Knowing the type of traffic by vehicle class by highway functional classification is critical to designing, maintaining and paying for North Carolina highway pavements. Thus, GVW plots by vehicle class and highway functional class are very important. The results indicate that in general, the class 5 and 9 GVW plots for all categories of WIM stations show expected trends. These results may be used by highway planners and pavement designers to quickly determine typical truck traffic profiles in the various NC regions and provide insight into NC truck transportation flows. NC vs. University Of Arkansas WIM QC Analysis: Most highway agencies have the data collection and design groups in different units. While a single software solution is not practical, it is recommended to perform two separate processes where the output of data QC meets the needs and standards of the design process. A comparative analysis between the QC meth.
Author : Aditya Narayanan Ramachandran
Publisher :
ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (465 download)
Download or read book Weigh in Motion Data Analysis written by Aditya Narayanan Ramachandran and published by . This book was released on 2009 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: MEPDG, Weigh in Motion, Data Analysis, Gross Vehicle Weight, Quality Control, Truck Traffic Flow.
Author : A. T. Papagiannakis
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (125 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 151 pages
Book Rating : 4.:/5 (913 download)
Download or read book Exploring Data Quality of Weigh-In-Motion Systems written by and published by . This book was released on 2013 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research focuses on the data quality control methods for evaluating the performance of Weigh-In-Motion (WIM) systems on Oregon highways. This research identifies and develops a new methodology and algorithm to explore the accuracy of each station's weight and spacing data at a corridor level, and further implements the Statistical Process Control (SPC) method, finite mixture model, axle spacing error rating method, and data flag method in published research to examine the soundness of WIM systems. This research employs the historical WIM data to analyze sensor health and compares the evaluation results of the methods. The results suggest the new triangulation method identified most possible WIM malfunctions that other methods sensed, and this method unprecedentedly monitors the process behavior with controls of time and meteorological variables. The SPC method appeared superior in differentiating between sensor noises and sensor errors or drifts, but it drew wrong conclusions when accurate WIM data reference was absent. The axle spacing error rating method cannot check the essential weight data in special cases, but reliable loop sensor evaluation results were arrived at by employing this multiple linear regression model. The results of the data flag method and the finite mixed model results were not accurate, thus they could be used as additional tools to complement the data quality evaluation results. Overall, these data quality analysis results are the valuable sources for examining the early detection of system malfunctions, sensor drift, etc., and allow the WIM operators to correct the situation on time before large amounts of measurement are lost.
Author : Bill M. McCall
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.3/5 (555 download)
Download or read book States' Successful Practices Weigh-in-motion Handbook written by Bill M. McCall and published by . This book was released on 1997 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Research Council (U.S.). Transportation Research Board
Publisher : Transportation Research Board National Research
ISBN 13 :
Total Pages : 582 pages
Book Rating : 4.:/5 (1 download)
Download or read book Statistically Based Acceptance Procedures, Quality Assurance, and Construction Management written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1986 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
