Practices to Manage Traffic Sign Retroreflectivity PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Practices to Manage Traffic Sign Retroreflectivity PDF full book. Access full book title Practices to Manage Traffic Sign Retroreflectivity by Jonathan M. Re. Download full books in PDF and EPUB format.
Author: Jonathan M. Re Publisher: Transportation Research Board ISBN: 0309223601 Category : Business & Economics Languages : en Pages : 54
Book Description
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.
Author: Jonathan M. Re Publisher: Transportation Research Board ISBN: 0309223601 Category : Business & Economics Languages : en Pages : 54
Book Description
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.
Author: National Cooperative Highway Research Program Publisher: ISBN: 9780309223607 Category : Highway engineering Languages : en Pages : 92
Book Description
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.
Author: Denis P. Paradis Publisher: ISBN: Category : Automobile driving at night Languages : en Pages : 110
Book Description
"One of the high priorities held by most transportation agencies, at all levels of government, is the provision of effective traffic signs to make the operation of highways, roads and streets safer. Retro-reflectivity of those signs is a key determinant of their effectiveness, and in Canada, signing standards and guidelines are set at a national level by the Transportation Association of Canada (TAC). Guidelines for minimum retroreflectivity levels have recently been published by TAC in response to the standard adopted in the United States in 2007 through the Federal Highway Administration (FHWA). These proposed guidelines for minimum retroreflectivity imply that the various transportation departments need to evaluate their current position with their existing inventory of traffic signs and determine the number of signs that are non-compliant and, hence, the number they will potentially have to replace. In response, the New Brunswick Department of Transportation and Infrastructure (NBDTI) had the University of New Brunswick Transportation Group conduct a study to estimate the proportion of traffic signs that fail to meet the minimum standards of retroreflectivity and to estimate the cost of replacing those signs. Over 1100 signs were sampled throughout New Brunswick in the various NBDTI Districts. In addition to retroreflectivity levels, other data were collected that have potential to provide some explanatory ability to predict retroreflectivity degradation. Analysis of the data revealed the factors having statistical significance include sign age, geographic location (District), road class (where sign was inventoried) and the visual condition rating given in the field. Retroreflectivity of the signs was compared to the minimum levels established by the FHWA (since TAC guidelines were only published post-analysis). About 20 percent of the existing signs do not meet the FHWA minimum standards of retroreflectivity."--Page ii.
Author: Howard Preston Publisher: ISBN: Category : Reflectors (Safety devices) Languages : en Pages : 45
Book Description
Highway agencies with an inventory of traffic signs must adopt a method of maintaining those signs so that the retroreflectivity exceeds established thresholds. Understanding expected sign life can help agencies phase sign replacements over a number of years in order to manage maintenance costs. The primary goal of this research is to provide objective data about sign life based on the degradation of retroreflectivity and color over time. A literature review found sign retroreflectivity research around the country, however, none of the studies are conclusive. Eight Minnesota agencies took retroreflectometer readings on in-place signs across the state. Disaggregated measurements by sheeting material and color did not leave a large enough sample for conclusive results, and very few signs fell below minimum retroreflectivity thresholds. Data suggests sign life exceeds the manufacturer's warranty and that a controlled environment with known conditions will produce more reliable data. MnDOT established a test deck at MnROAD to take multiple retroreflectivity and color readings over time to the point of failure in a controlled environment. The best information inferred from the results is an estimate for an expected sign life of 12 to 20 years for beaded sheeting and 15 to 30 years for prismatic sheeting. Agencies are encouraged to move forward and adopt a sign maintenance method and expected sign life by bringing sign management decisions under an umbrella of immunity. This document has suggested best policy practices and statements for sign maintenance and management assembled by a panel including engineers and risk management specialists.
Author: Hugh W. McGee Publisher: ISBN: Category : Reflectance Languages : en Pages : 64
Book Description
To assist agencies in developing a cost-effective program for timely replacement of ineffective signs, this document was prepared. Initially the report describes the principles of retroreflectivity, the types of retroreflective materials, and the proposed minimum retroreflectivity guidelines. Then, the report presents the concept of a sign management system, and provides guidance for developing a sign inventory, conducting sign inspections, and maintaining signs. The report concludes with discussing options that State and local agencies can follow for replacing their ineffective signs and offers a minimum and desirable program.
Author: Kenneth S. Opiela Publisher: ISBN: Category : Reflectance Languages : en Pages : 32
Book Description
"This report analyzes the impacts that might be expected from the adoption of proposed minimum maintained retroreflectivity levels for traffic signs to improve night visibility. The report evaluates the broad spectrum of concerns expressed by State and local agency staff at four workshops held during the summer of 2002. These include administrative, fiscal, implementation, and tort liability concerns"--Technical report documentation page.
Author: Jonathan M. Re
Author: Jonathan M. Re
Author: 
Author: National Cooperative Highway Research Program
Author: Kent L. Black
Author: H. Gene Hawkins
Author: Denis P. Paradis
Author: Gerardo W. Flintsch
Author: Howard Preston
Author: Hugh W. McGee
Author: Kenneth S. Opiela