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Estimating Link Travel Time On I 70 Corridor
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Book Synopsis Estimating Link Travel Time on I-70 Corridor by : Sarosh I. Khan
Download or read book Estimating Link Travel Time on I-70 Corridor written by Sarosh I. Khan and published by . This book was released on 2000 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report represents the findings of a study that demonstrates the feasibility of estimating link travel time and speed in real-time for rural, mountainous sections of interstate freeway in Colorado using vehicles instrumented with global positioning system (GPS) receivers, serving as probes in traffic streams. The system configuration developed includes a cost-effective, portable GPS deployment unit, communication links to a server PC and an integrated prototype system for vehicle tracking and estimating link travel time statistics. This study was carried out in two phases. The objective of the first phase was to identify a cost-effective means of monitoring traffic within a rural, mountainous stretch of the I-70 freeway. An algorithm was developed to estimate average link speed, travel time and the standard error of estimates to provide user information on the reliability of the estimates based on the probe data. The algorithm was tested for different traffic conditions and geometric characteristics of links. In the second phase of the project, a real-time demonstrational prototype was developed to receive, process and estimate link travel time and speed statistics in real-time. The system was tested off-line and on-line based on field data received from the I-70 corridor. In addition, GPS receivers were deployed using a commercial vanpool service and the system was evaluated further.
Book Synopsis Estimating Corridor Travel Time Using Point and Probe Detector Data by : William Eisele
Download or read book Estimating Corridor Travel Time Using Point and Probe Detector Data written by William Eisele and published by LAP Lambert Academic Publishing. This book was released on 2012-05 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Accurate estimation of travel time is increasingly important for transportation system operators. Travel times are estimated indirectly by using instantaneous speeds from point detectors (e.g., inductance loops, radar), and making a number of assumptions. Travel times also may be obtained from probe data obtained from automatic vehicle identification (AVI) systems (e.g., toll tags), global positioning systems (GPS), and cell phones. In this book, Dr. Eisele examines various methods of estimating corridor travel time mean and variance using link travel times derived from point and/or probe data. In addition, the covariance in travel time between links is also directly accounted for in the methodology. The end result is that the user may quantitatively assess the accuracy of the estimated corridor travel times. The book will be useful to operators of Intelligent Transportation Systems (ITS) who are interested in obtaining real-time estimates of corridor travel time. It will also be useful to off-line users of ITS data, such as transportation planners, who are interested in measuring the performance of the system." Dr. Laurence R. Rilett, Director, Nebraska Transportation Center
Book Synopsis Estimate Link Travel Time Using Probe Vehicle by : Lu Li
Download or read book Estimate Link Travel Time Using Probe Vehicle written by Lu Li and published by . This book was released on 1999 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Using RTD's Transit Vehicles to Develop Freeway Speed Maps for Colorado by : Sarosh Khan
Download or read book Using RTD's Transit Vehicles to Develop Freeway Speed Maps for Colorado written by Sarosh Khan and published by . This book was released on 2004 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of Various Corrosion Protection Systems of Bridges in Colorado by : Yunping Xi
Download or read book Performance Evaluation of Various Corrosion Protection Systems of Bridges in Colorado written by Yunping Xi and published by . This book was released on 2004 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion of reinforced concrete structures has been a significant problem for many state and transportation agencies since the application of deicing salts was introduced. Much research has been conducted to develop corrosion protection systems that can prolong the life span of reinforced concrete structures. The Colorado Department of Transportation (CDOT) has several routine and experimental measures to prevent corrosion of the rebar including epoxy-coated rebar, calcium nitrite admixture, organic corrosion inhibitors, a thick cover of quality concrete, and a waterproofing membrane covered by an asphalt overlay. An extensive literature review was performed to collect information on various corrosion protection systems that have been used in the U.S. and around the world. Current CDOT practices in terms of corrosion protection measures were reviewed. A draft inspection plan for Colorado's bridge structures was proposed.
Book Synopsis Dynamic Travel Time Estimation for Northeast Illinois Expressways by : Abolfazl Mohammadian
Download or read book Dynamic Travel Time Estimation for Northeast Illinois Expressways written by Abolfazl Mohammadian and published by . This book was released on 2020 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Traffic Data Collection and its Standardization by : Jaume Barceló
Download or read book Traffic Data Collection and its Standardization written by Jaume Barceló and published by Springer Science & Business Media. This book was released on 2010-07-20 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: A nice night of October 2007, in Beijing, during the XV World Conference on ITS a number of colleagues met informally for a dinner party that spontaneously became a vivid discussion on the importance of traffic data for all types of p- poses. Researchers can hardly do any progress in modeling, developing, and te- ing theories without suitable data, and what practitioners can do in real life is limited not only by technology but also by the availability of the required data. Quite frequently, the data and not the technologies are what determine how far we can go. Any discussion about traffic data leads in a natural way to a discussion on the variety of traffic data sources, formats, levels of aggregation, accuracies, and so on. Consequently, we moved to talk on the initiative that Kuwahara had undertaken in his traffic laboratory at the University of Tokyo, known as the International Traffic Data Base, and thus smoothly but inexorably we came to agree that it would be convenient to organize a workshop to continue our discussion at a more formal level, share our points of view with other colleagues, listen what they had to say and, if possible, d- seminate the findings in our professional and academic communities.
Book Synopsis Evaluation and Comparison of Three Chemical Deicers for Use in Colorado by : William M. Lewis
Download or read book Evaluation and Comparison of Three Chemical Deicers for Use in Colorado written by William M. Lewis and published by . This book was released on 2001 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Review of the Public-Private Initiatives Program of the Colorado Department of Transportation by : Porter K. Wheeler
Download or read book Review of the Public-Private Initiatives Program of the Colorado Department of Transportation written by Porter K. Wheeler and published by . This book was released on 2000 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report assesses the current Public-Private Initiatives (PPI) program from the perspective of all participants and incorporates best practices from other states. Section 2 summarizes innovative finance. The current PPI program and processes are reviewed in section 3. In section 4 the best practices of selected PPI programs in other states and jurisdictions are examined. In section 5 the recommendations for the Colorado Department of Transportation's considerations are presented in the key areas of policy/legal, process, and management.
Book Synopsis The Impact of CDOT Research by : Beth Moore
Download or read book The Impact of CDOT Research written by Beth Moore and published by . This book was released on 2002 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of Travel Time Estimation Based on Point Sensors by : Russell Bartlett Holt
Download or read book An Investigation of Travel Time Estimation Based on Point Sensors written by Russell Bartlett Holt and published by . This book was released on 2003 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several transportation agencies are currently estimating freeway travel times using data provided by inductive loop detectors. These point detectors typically report only aggregated values of volume, lane occupancy, and time-mean-speed at relatively short polling intervals. Travel time estimation methods that assume speeds measured at points are representative of actual travel speeds over segments of roadway are called extrapolation methods. While the literature indicates that extrapolation methods should not be used during congested traffic conditions, little research has been completed to quantify the nature of the specific estimation errors. Meanwhile, travel times estimated and predicted using these methods continue to be disseminated in real-time to motorists along major freeways in several large U.S. cities. The goals of this research are to examine the prevailing issues that reduce the accuracy of extrapolation-based travel time estimation methods and to quantify the errors resulting from these driving implementation issues. First, the three primary sources of error that routinely threaten the accuracy of extrapolation methods are identified and critically examined. Next, a microscopic traffic simulation model is used to develop a generic half mile freeway link that allows for the quantification of (1) the discrepancies between space mean-speeds and time-mean-speeds (as measured at the point detectors), and (2) the typical extrapolation travel time estimation errors that can be expected if detector stations are located within different regions of the half-mile freeway link. Finally, the link-based findings are applied to both a simulated freeway corridor and a field data set to demonstrate the limitations of using extrapolation methods during time periods when recurring and nonrecurring (incident-based) congestion exists. The findings reveal that although extrapolation methods can be used with sufficient accuracy during free-flow (uncongested) traffic conditions, the use of these methods during time periods when congestion is present will result in large errors between estimated travel times and actual experienced travel times. Specifically, the results show that the half-mile link travel time estimates consistently underestimate actual link travel times by more than 30% when the traffic demand exceeds 85% of the capacity of the freeway link. The application of the link-based findings to longer freeway corridors also suggests that estimation errors over each individual detector station influence area tend to sum together when extrapolation methods are used along lengthy corridors experiencing heavy congestion.
Book Synopsis Cost-benefit Evaluation Committee by : Timothy Aschenbrener
Download or read book Cost-benefit Evaluation Committee written by Timothy Aschenbrener and published by . This book was released on 2001 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this evaluation was to document a cost-benefit evaluation of the 3-year warranty specification and projects for hot bituminous pavements (HBP). There were 6 warranty projects evaluated that included 3 projects whose warranty terms had expired. Each warranty project was compared to a comparable non-warranted project.
Book Synopsis Stone Mastic Asphalt in Colorado by : Donna S. Harmelink
Download or read book Stone Mastic Asphalt in Colorado written by Donna S. Harmelink and published by . This book was released on 2001 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the construction and performance of the Colorado Department of Transportation's (CDOT's) first two Stone Mastic Asphalt (SMA) projects. The first project, located on SH 119 from SH 52 to Longmont, contained three SMA mixes, two polymer-stabilized mixes and one fiber mix. This project successfully demonstrated the design, production and placement of SMA. The second project located on the Colfax Viaduct in Denver was CDOT's first attempt to use SMA on a bridge deck. This project used a polymer-stabilized mix. This project successfully demonstrated the placement of SMA on a bridge deck. SMA is currently being used as a wearing surface in Colorado. Guidelines and a best practice guide have been developed and have been adopted for statewide use. In addition, CDOT's Bridge Branch has developed a specification for using SMA as part of the overlay system.
Book Synopsis Construction and Monitoring of Post-tensioned Masonry Sound Walls by : David B. Woodham
Download or read book Construction and Monitoring of Post-tensioned Masonry Sound Walls written by David B. Woodham and published by . This book was released on 2002 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this project was to document the installation of a post-tensioned concrete masonry sound wall constructed as part of a widening and sound wall project along US 36 near Denver, Colorado. In addition, the wall was instrumented at the time of construction to monitor the loss in prestress in the steel tendons over time due to concrete masonry creep and shrinkage and steel relaxation. Tendon tension was monitored for one year to obtain values for the accumulated losses. Accurate losses in post-tensioned concrete masonry are important for economical design. Currently, there are limited data to support an accurate prediction of prestress loss in concrete masonry.
Book Synopsis In-place Voids Monitoring of Hot Mix Asphalt Pavements by : Donna S. Harmelink
Download or read book In-place Voids Monitoring of Hot Mix Asphalt Pavements written by Donna S. Harmelink and published by . This book was released on 2002 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1995, the Colorado Department of Transportation implemented the Superpave gyratory mix design to select the optimum asphalt content of a mixture. The optimum asphalt content was not the same as what the department had historically used. The purpose of this study was to gather data to validate the number of gyrations that should be used with the Superpave mix design. Based on the data gathered from the 25 evaluation sections, the optimal number of design gyrations for the Field Mixed/Lab Compacted material is too high. Mixes appear to be too stiff for the traffic and environmental conditions.
Download or read book Cost of Sanding written by and published by . This book was released on 2002 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improving Colorado Transportation Through Investigation and Innovation by : Beth Moore
Download or read book Improving Colorado Transportation Through Investigation and Innovation written by Beth Moore and published by . This book was released on 1999 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary of current research studies.
