Download or read book Sampling Techniques for the Collection of Vehicle Classification Data written by Jerry G. Pigman and published by . This book was released on 1985 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vehicle Classification Sampling Methodology Evaluation written by Wisconsin. Department of Transportation. Division of Planning & Budget and published by . This book was released on 1978 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Validation of Urban Vehicle Classification Sampling Methodology written by and published by . This book was released on 2005 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mobility Analysis Section of the CDOT Division of Transportation Development (DTD) developed this study to determine whether the cluster count method developed by CDOT is statistically reliable for estimating vehicle classification on urban roadways with average daily traffic volumes exceeding 15,000 vehicles per day. Specifically, CDOT needed to assess whether or not the percentages of vehicles in the 13 FHWA vehicle classifications estimated by the cluster count method differ significantly from expected percentages obtained by 24-hour counts. Since vehicle classification is expensive to perform by manual observation over long periods of time, a statistically reliable method of estimating vehicle type percentages on urban roadways using a less time-consuming method is desirable. The study team utilized the chi-square statistical test to evaluate the similarity between vehicle classifications collected using the cluster count method and 24-hour vehicle counts collected using other data collection methods. Vehicle classification data were collected at 12 sites around Denver, Colorado that represented different roadway classes. The statistical tests between the data collected using the cluster count method and the 24-hour counts revealed that the current cluster count method varied beyond an acceptable statistical similarity to the 24-hour counts. Upon reaching this conclusion, the study panel simulated various changes to the short duration count methodology in an effort to identify the greatest improvement in statistical accuracy. As a result of this study, the recommended short duration vehicle classification methodology requires vehicle counts to be performed for 15 minutes every hour for a 24-hour period. This method exhibits strong statistical similarity to the 24-hour classification counts for all roadway classes and study sites included in this analysis. This collection method is statistically accurate, easy for field personnel to understand and collect, and is about onethird of the cost of a manual 24-hour count. The Mobility Analysis Section of DTD has developed a guidebook on the recommended short duration count methodology that will be available to CDOT staff, data collectors, consultants, and other public agencies. This guidebook outlines how to collect the short duration classification data, process and manage the data, and perform quality control checks.

Download or read book Using the Traffic Monitoring Guide to Develop a Truck Weight Sampling Procedure for Use in Virginia written by Benjamin H. Cottrell and published by . This book was released on 1992 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Traffic Monitoring Guide (TMG) provides a method for the development of a statistically based procedure to monitor traffic characteristics such as traffic loadings. Truck weight data in particular are a major element of the pavement management process because there is a strong relationship between pavement deterioration and truck weights. Because truck weight data collected by weigh-in-motion (WIM) systems are more representative of actual traffic loadings and are more efficient than enforcement and static weight data, the use of the TMG and WIM systems together provide improved monitoring of truck weights. The objective of this research was to develop a plan for VDOT to implement a truck weight sampling procedure using the TMG and WIM systems. Four alternatives from the TMG that were based on different schemes for multiple measurements at permanent WIM sites were evaluated. A truck weight sampling plan was developed for the preferred alternative. Truck weight sample sites, data collection procedures, cost and resources estimates, data from permanent WIM sites, and data management information are included in the plan.

Download or read book Adaptive Sampling Methods for Vehicle Trajectory Data written by Choudhury Nazib Wadud Siddique and published by . This book was released on 2019 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ubiquitous use of smartphones and the emergence of new technologies such as ridesourcing and connected/automated vehicles provide new opportunities for mobile sensors in traffic monitoring and data collection. To make GPS based smartphones an effective and practical source of transportation data, one needs to address the multifaceted challenges related to mobile sensing. Since the mobile sensing technology requires individual sensors (often from end-users) sending location information periodically to the data collector (e.g., a server), one of such challenges is the storage and data transmission cost incurred to individual sensors/users, as well as the battery life of mobile sensors. This research aims to balance the data transmission cost and the needs to collect detailed mobile sensing data by developing a method to resample the smartphone-based GPS data at the user side. The work introduces the concept of Vehicle Flow State (VFS) to explain the implicit nature of the probe vehicle's motion. Then the work proposes a methodology which first estimates the vehicle flow state (VFS) of the sensor/vehicle from its trajectory data and then uses the estimated VFS to adjust the sampling rate of the trajectory accordingly. The primary contributions of this work are as follows. First, this work develops the concept of vehicle flow state (VFS) and developed an HMM-based method to identify the VFS of an individual vehicle. Second, two self-adaptive sampling strategies for vehicle trajectory data are presented based on the identified VFS, which reduces the overall data size and transmission cost. Finally, this work presents comprehensive testing and validation of the proposed methods with real-world trajectory data. The methods and algorithms provided in this work will be of significant value to the server-side and the user/client side of a smartphone-based vehicle trajectory data collection system. The reduced data using proposed methods show a promising result in traffic modeling applications (such as queue length estimation) and the end user's privacy protection.

Download or read book Vehicle Classification Survey Data Collection Methods and Analysis written by Wisconsin. Department of Transportation. Division of Planning and published by . This book was released on 1977 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adaptive Video based Vehicle Classification Technique for Monitoring Traffic written by and published by . This book was released on 2015 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a methodology for extracting two vehicle features, vehicle length and number of axles in order to classify the vehicles from video, based on Federal Highway Administration's (FHWA's) recommended vehicle classification scheme. There are two stages regarding this classification. The first stage is the general classification that basically classifies vehicles into 4 categories or bins based on the vehicle length (i.e., 4-Bin length-based vehicle classification). The second stage is the axle-based group classification that classifies vehicles in more detailed classes of vehicles such as car, van, buses, based on the number of axles. The Rapid Video-based Vehicle Identification System (RVIS) model is developed based on image processing technique to enable identifying the number of vehicle axles. Also, it is capable of tackling group classification of vehicles that are defined by axles and vehicle length based on the FHWA's vehicle classification scheme and standard lengths of 13 categorized vehicles. The RVIS model is tested with sample video data obtained on a segment of I-275 in the Cincinnati area, Ohio. The evaluation result shows a better 4-Bin length-based classification than the axle-based group classification. There may be two reasons. First, when a vehicle gets misclassified in 4-Bin classification, it will definitely be misclassified in axle-based group classification. The error of the 4-Bin classification will propagate to the axle-based group classification. Second, there may be some noises in the process of finding the tires and number of tires. The project result provides solid basis for integrating the RVIS that is particularly applicable to light traffic condition and the Vehicle Video-Capture Data Collector (VEVID), a semi-automatic tool to be particularly applicable to heavy traffic conditions, into a "hybrid" system in the future. Detailed framework and operation scheme for such an integration effort is provided in the project report.

Download or read book Vehicle Classification Data Expansion written by Wisconsin. Department of Transportation. Division of Planning & Budget and published by . This book was released on 1980 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Methodology for Determining Truck Vehicle Miles Traveled in Illinois written by R. F. Benekohal and published by . This book was released on 2002 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nationwide surveys of departments of transportation, metropolitan planning organizations, and classification vendors/producers were conducted to determine the state of practice on equipment and methodologies used to determine truck vehicle miles traveled (VMT). The current Illinois Department of Transportation (IDOT) methodology was evaluated and it was found that it overestimated truck VMT for multi-unit trucks on all eight functional classes except on the minor urban arterials. The average overestimation was 11.5% and it varied from -10% to +44%. The current method overestimated truck VMT for single-unit trucks in five and underestimated in three functional classes. The under/over estimation ranged from -6% to +35%, but the average value was close to zero. To calculate truck VMT more accurately, this study proposed two different methods based on average truck percentage (ATP) and average section length (ASL). In the ATP method, truck VMT is calculated by multiplying the ATP for a group of roadway sections by the total VMT of that group. The ATP method should be used when the ATP and the total VMT by volume groups are available. In the ASL method, the total truck volume for the sampled sections is multiplied by the ASL. The ASL method should be used when the information required for ATP is not available or not reliable. Sample size influences the accuracy of truck VMT estimation and the decision on sample size must consider the error level that is acceptable. This study looked at the likely error for different sample sizes and recommended using 8% to 16% of the number of roadway sections. The sections should be distributed among the volume groups. Recently, IDOT collects vehicle classification data for three categories at about 10,000 sections, biennially. It is recommended to evaluate the truck VMT calculation using recent data.

Download or read book Development of Urban Travel Monitoring Methods written by and published by . This book was released on 1981 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Traffic Data Collection and Analysis written by Alexander French and published by Transportation Research Board National Research. This book was released on 1986 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to traffic engineers, highway planners, and others concerned with the collection of traffic data for traffic engineering studies, for long-range planning, and for evaluation of traffic law enforcement. Information is presented on current practice in traffic data collection and analysis. Although types of highway traffic data collected over the past 50 years have not changed significantly, the quantities, analysis procedure, and presentations of these data have changed as a result of changing policies, operational concerns, and capabilities resulting from new technologies. This report of the Transportation Research Board describes the technology (both hardware and software) that is being used for traffic data collection, and discusses technological advances that have not yet been applied to the acquisition and presentation of traffic data.

Download or read book Monitoring Forecasting written by and published by . This book was released on 1980 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transportation Planning Applications Final Report written by William Frederick Brown and published by . This book was released on 1987 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Highway Safety Literature written by and published by . This book was released on 1980 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guide to Urban Traffic Volume Counting written by R. A. Ferlis and published by . This book was released on 1981 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents methods by which urbanized areas can develop and implement integrated traffic data counting programs to serve the volume data needs of all their agencies. The procedures presented complement the techniques for measuring vehicle type and occupancy presented in the Guide for Estimating Urban Vehicle Classification and Occupancy. Methods for estimating volume at a single location, volume across a particular cordonline or cutline, vehicle-miles travelled within a corridor, and regional vehicle-miles travelled are presented. Of particular value to transportation technical staffs in urban areas, these techniques permit collection of volume data at pre-determined levels of precision, and in a cost-effective manner.

Download or read book Structural Syntactic and Statistical Pattern Recognition written by Ana Fred and published by Springer. This book was released on 2004-10-29 with total page 1186 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains all papers presented at SSPR 2004 and SPR 2004, hosted by the Instituto de Telecomunicac ̃ ̧oes/Instituto Superior T ́ ecnico, Lisbon, Portugal, August 18-20, 2004. This was the fourth time that the two workshops were held back-to-back. The SSPR was the tenth International Workshop on Structural and Synt- tic Pattern Recognition, and the SPR was the ?fth International Workshop on Statistical Techniques in Pattern Recognition. These workshops have traditi- ally been held in conjunction with ICPR (International Conference on Pattern Recognition), and are the major events for technical committees TC2 and TC1, respectively, of the International Association for Pattern Recognition (IAPR). The workshops were closely coordinated, being held in parallel, with plenary talks and a common session on hybrid systems. This was an attempt to resolve thedilemmaofhowto dealwiththeneedfornarrow-focusspecializedworkshops yet accommodate the presentation of new theories and techniques that blur the distinction between the statistical and the structural approaches. A total of 219 papers were received from many countries, with the subm- sion and reviewing processes being carried out separately for each workshop. A total of 59 papers were accepted for oral presentation and 64 for posters. In - dition, four invited speakers presented informative talks and overviews of their research. They were: Alberto Sanfeliu, from the Technical University of Cata- nia, Spain; Marco Gori, from the University of Siena, Italy; Nello Cristianini, from the University of California, USA; and Erkki Oja, from Helsinki University of Technology, Finland, winner of the 2004 Pierre Devijver Award.

Download or read book Research Methods for Construction written by Richard F. Fellows and published by John Wiley & Sons. This book was released on 2015-07-07 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research Methods for Construction will help you instil rigour into your problem-solving, and into your reports and publications. It will be of value to construction, surveying, architecture and civil engineering students undertaking research, whether for bachelors and masters degree dissertations, or for masters and doctoral research degree theses. Now in its Fourth Edition, this remains one of the few books to provide guidance on research formulation, methodologies, and methods specifically for construction students. Three main sections – Producing a Proposal, Executing the Research and Reporting the Results discuss the key issues in research and examine the primary approaches, both qualitative and quantitative. The methods adopted for scientific and engineering experiments, model building and simulations are discussed, as well as those employed for research into management, social and economic issues. The authors examine the requirements for data and analysis, including the important statistical considerations and a range of qualitative techniques that enable construction researchers to appreciate what needs to be evaluated in devising how research may be carried out effectively and efficiently. This new edition has been updated to reflect current debates and concerns, including ethical issues, legislation and codes of practice concerning the collection, processing, storage, use and disposal of data. Pressures of time and funding to carry out the empirical work all too often lead to a lack of attention to how the study should be done and why. The authors address the importance of explaining the philosophical approach adopted (ontology, epistemology) and the consequent methodology. They advocate close scrutiny of the methods available for appropriateness, both academically and practically. The fundamental theme of the book remains to facilitate a researcher’s informed and justified selection of a philosophical paradigm and of appropriate methods to execute the research.