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Bridge Rail And Approach Railing For Low Volume Roads In Iowa
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Book Synopsis Bridge Rail and Approach Railing for Low-volume Roads in Iowa by : Jake J. Bigelow
Download or read book Bridge Rail and Approach Railing for Low-volume Roads in Iowa written by Jake J. Bigelow and published by . This book was released on 2010 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Guidelines for bridge rail and approach guardrails can help improve the safety benefits of these devices while minimzing [i.e., minimizing] costs.
Book Synopsis Upgrading Bridge Rails on Low-volume Roads in Iowa by : Zachary Hans
Download or read book Upgrading Bridge Rails on Low-volume Roads in Iowa written by Zachary Hans and published by . This book was released on 2016 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on previous research, the goal of this project was to identify significant influencing factors for the Iowa Department of Transportation (DOT) to consider in future updates of its Instructional Memorandum (I.M.) 3.213, which provides guidelines for determining the need for traffic barriers (guardrail and bridge rail) at secondary roadway bridges—specifically, factors that might be significant for the bridge rail rating system component of I.M. 3.213. A literature review was conducted of policies and guidelines in other states and, specifically, of studies related to traffic barrier safety countermeasures at bridges in several states. In addition, a safety impact study was conducted to evaluate possible non-driver-related behavior characteristics of crashes on secondary road structures in Iowa using road data, structure data, and crash data from 2004 to 2013. Statistical models (negative binomial regression) were used to determine which factors were significant in terms of crash volume and crash severity. The study found that crashes are somewhat more frequent on or at bridges possessing certain characteristics—traffic volume greater than 400 vehicles per day (vpd) (paved) or greater than 50 vpd (unpaved), bridge length greater than 150 ft (paved) or greater than 35 ft (unpaved), bridge width narrower than its approach (paved) or narrower than 20 ft (unpaved), and bridges older than 25 years (both paved and unpaved). No specific roadway or bridge characteristic was found to contribute to more serious crashes. The study also confirmed previous research findings that crashes with bridges on secondary roads are rare, low-severity events. Although the findings of the study support the need for appropriate use of bridge rails, it concludes that prescriptive guidelines for bridge rail use on secondary roads may not be necessary, given the limited crash expectancy and lack of differences in crash expectancy among the various combinations of explanatory characteristics.
Book Synopsis Upgrading of Bridge Approach Guardrail on Primary Roads in Iowa by : Walter A. Schwall
Download or read book Upgrading of Bridge Approach Guardrail on Primary Roads in Iowa written by Walter A. Schwall and published by . This book was released on 1989 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development and Testing of a Bridge Rail for Low-volume Roads by : Scott K. Rosenbaugh
Download or read book Development and Testing of a Bridge Rail for Low-volume Roads written by Scott K. Rosenbaugh and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Limited Funds and Numerous Deficient Off-system Bridges Create Federal Bridge Program Dilemma by : United States. General Accounting Office
Download or read book Limited Funds and Numerous Deficient Off-system Bridges Create Federal Bridge Program Dilemma written by United States. General Accounting Office and published by . This book was released on 1983 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Safety and Cost-effectiveness of Bridge-approach Guardrail for County State-aid (CSAH) Bridges in Minnesota by : Timothy J. Gates
Download or read book The Safety and Cost-effectiveness of Bridge-approach Guardrail for County State-aid (CSAH) Bridges in Minnesota written by Timothy J. Gates and published by . This book was released on 2005 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge-approach guardrail provides protection for vehicles from collision with bridge components, such as the blunt end of the bridge rail or abutment, and other types of run-off-the-road collisions. The primary objective of this research was to determine the average daily traffic (ADT) at which the benefit/cost ratio for the installation of approach guardrail at county-state-aid (CSAH) bridges in Minnesota becomes greater than 1.0. A survey of state transportation agencies found that 26 of 35 responding agencies have policies or guidelines requiring placement of approach guardrail on any bridge if the bridge was built using state funds. Results of the research analyses showed that bridge-approach guardrail was effective at reducing the severity of run-off-the-road crashes occurring on the approach or departure to CSAH bridges. Fatalities and A-injury crashes accounted for only 6 percent of the crashes occurring at bridges with approach guardrail compared to 28.5 percent at bridges without approach guardrail. The subsequent benefit/cost analysis showed that bridge-approach guardrail is cost-effective (i.e., B/C> 1) for CSAH bridges with ADT greater than or equal to 300 vehicles per day (vpd). Overall, approach guardrail has a benefit/cost ratio of approximately 3.5 to 5.5. The researchers recommended that the ADT threshold for approach guardrail on CSAH bridges be set at 400 vpd, which is consistent with previous Mn/DOT standards and AASHTO low-volume local road guidelines. Approach guardrail should be considered on a case-by-case basis for bridges with ADT between 150 and 400 vpd, especially those between 300 and 400 vpd. Placement of approach guardrail at bridges with ADT less than 150 vpd is not cost-effective in most cases.
Book Synopsis Investigation of Two Bridge Alternatives for Low Volume Roads: Concept 1. Steel beam precast units by :
Download or read book Investigation of Two Bridge Alternatives for Low Volume Roads: Concept 1. Steel beam precast units written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plans for Crash-tested Bridge Railings for Longitudinal Wood Decks on Low-volume Roads by :
Download or read book Plans for Crash-tested Bridge Railings for Longitudinal Wood Decks on Low-volume Roads written by and published by . This book was released on 1998 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Iowa DOT Combination Bridge Separation Barrier with Bicycle Railing, Phase I by : Chaz M. Ginger
Download or read book Development of Iowa DOT Combination Bridge Separation Barrier with Bicycle Railing, Phase I written by Chaz M. Ginger and published by . This book was released on 2019 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Iowa Department of Transportation (Iowa DOT) typically builds separation barriers between vehicle and pedestrian/bicycle facilities when sidewalks or trails are present on vehicular bridges. Currently, Iowa DOT employs a combination bridge rail that utilizes a concrete parapet that had previously been successfully evaluated to National Cooperative Highway Research Program (NCHRP) Report No. 350 Test Level 4 (TL-4) criteria for these situations. While the parapet had been successfully evaluated, the combination bridge rail system as a whole had not been evaluated to any crash test standards. Iowa DOT desired that researchers at Midwest Roadside Safety Facility (MwRSF) design and test a combination bridge separation barrier to current Manual for Assessing Safety Hardware, Second Edition (MASH 2016) TL-2 standards to use in place of their current, untested system. During this effort, previous combination rails, low-height vertical parapets, and zone of intrusion (ZOI) studies were reviewed to provide guidance on system design. A simulation effort was also performed to aid in height selection of the parapet, as well as placement of the attached bicycle rail to reduce the amount of negative vehicle-to-rail interaction with the system. Using the gathered data, a full system design was produced. It was then recommended that the proposed system be evaluated to MASH 2016 test designation no. 2-11 in order to assess the system's performance during a vehicle impact scenario.
Book Synopsis Full-scale 1,800 Lb. Vehicle Crash Test on the Iowa W-beam Approach Guardrail to the Concrete Safety Shape Bridge Rail by : Brian G. Pfeifer
Download or read book Full-scale 1,800 Lb. Vehicle Crash Test on the Iowa W-beam Approach Guardrail to the Concrete Safety Shape Bridge Rail written by Brian G. Pfeifer and published by . This book was released on 1991 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annual Report of Iowa Highway Research Board Research and Development Activities for the Fiscal Year Ending ... by : Iowa. Highway Research Board
Download or read book Annual Report of Iowa Highway Research Board Research and Development Activities for the Fiscal Year Ending ... written by Iowa. Highway Research Board and published by . This book was released on 2008 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alternative Solutions to Meet the Service Needs of Low Volume Bridges in Iowa by : F. W. Klaiber
Download or read book Alternative Solutions to Meet the Service Needs of Low Volume Bridges in Iowa written by F. W. Klaiber and published by . This book was released on 2004 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary focus of this study was to review the various aspects of off-system bridge design, rehabilitation, and replacement. Specifically, a reference report was developed to address common problems in low volume road (LVR) bridges. The source of information included both Iowa and national agencies. This report is intended to be a "user manual" or "tool box" of information, procedures and choices for county engineers to employ in the management of their bridge inventory plus identify areas and problems that need to be researched. To obtain pertinent published information, past Iowa Highway Research Board projects were identified and reviewed. A questionnaire was sent to all Iowa county engineers to determine the various problems that are encountered on LVR and their solutions to these problems.
Book Synopsis Development of Iowa DOT Combination Bridge Separation Barrier with Bicycle Railing, Phase II by : Chaz M. Ginger
Download or read book Development of Iowa DOT Combination Bridge Separation Barrier with Bicycle Railing, Phase II written by Chaz M. Ginger and published by . This book was released on 2020 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: A combination bridge rail was designed and crash tested for Iowa Department of Transportation (Iowa DOT) for use alongside a pedestrian/bicycle bridge pathway that would satisfy Manual for Assessing Safety Hardware (MASH) 2016 Test Level 2 (TL-2) criteria. Currently, Iowa DOT employs a combination bridge rail that utilizes a concrete parapet that had previously been successfully evaluated according to National Cooperative Highway Research Program (NCHRP) Report No. 350 TL-4 criteria. While the parapet had been successfully evaluated, the combination bridge rail system as a whole had not been evaluated to any crash test standards. Thus, Iowa DOT desired that researchers at Midwest Roadside Safety Facility (MwRSF) test the new combination bridge separation barrier to current MASH 2016 TL-2 standards to use in place of their current, untested system. The new combination bridge rail system consisted of a pedestrian/bicycle railing mounted atop a vertical concrete parapet. The pedestrian/bicycle railing featured spliced longitudinal rails welded atop structural steel tube posts with welded steel base plates for attachment atop the parapet. In full-scale crash test no. IBBR-1, the 2270P vehicle was successfully redirected, resulting in minimal damage to the rail from plastic deformation and minimal damage to the parapet. This combination bridge rail design minimized the concrete parapet height that could be used in order to safely redirect the impacting vehicle, thus providing many advantages such as reduced dead weight on bridges, decreased construction costs, and improved sight lines.
Book Synopsis Full-scale 5,400 lb. vehicle crash test on the Iowa w-beam approach guardrail to the concrete safety shape bridge rail by :
Download or read book Full-scale 5,400 lb. vehicle crash test on the Iowa w-beam approach guardrail to the concrete safety shape bridge rail written by and published by . This book was released on 1990 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Top-mounted W-beam Bridge Railing for Longitudinal Glulam Timber Decks Located on Low-volume Roads by : Ronald K. Faller
Download or read book Top-mounted W-beam Bridge Railing for Longitudinal Glulam Timber Decks Located on Low-volume Roads written by Ronald K. Faller and published by . This book was released on 1996 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Two Bridge Alternates for Low Volume Roads by : Terry J. Wipf
Download or read book Investigation of Two Bridge Alternates for Low Volume Roads written by Terry J. Wipf and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis TL-1 Curb-type Bridge Railing for Longitudinal Glulam Timber Decks Located on Low-volume Roads by : Ronald K. Faller
Download or read book TL-1 Curb-type Bridge Railing for Longitudinal Glulam Timber Decks Located on Low-volume Roads written by Ronald K. Faller and published by . This book was released on 1996 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
