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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: 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: Carly MacEacheron Publisher: ISBN: Category : Road markings Languages : en Pages : 0
Book Description
Pavement markings with retroreflective properties provide delineation and safety benefits for drivers during nighttime conditions. The New Brunswick Department of Transportation and Infrastructure (NBDTI) do not have a history of retroreflectivity performance for pavement markings throughout their life-cycles. This makes it difficult to assess the impacts of a potential minimum retroreflectivity standard such as that proposed by the Federal Highway Administration (FHWA) or to adopt performance-based specifications. A year-long study of pavement markings on 24 sampled road sections was performed to understand the state of pavement markings in New Brunswick and the causes/rates of their deterioration. Analyses found the factors that have a statistically significant effect on pavement marking retroreflectivity include age, traffic volume, road class, season in which the marking was applied, and paint colour. Graphical analyses of the sampled retroreflectivity values over time found that they generally deteriorate over time, and that white markings consistently produce higher readings than yellow markings through their life-cycle even though white markings deteriorate more quickly. Overall only 27% of the markings sampled complied with the FHWA-proposed retroreflectivity standard at the time of their replacement; nearly half failed between six months and one year. The analysis suggested that the current pavement marking maintenance schedule would be inadequate if FHWA’s minimum retroreflectivity standards were to be adopted in New Brunswick. It is recommended that NBDTI govern a pavement marking policy that will improve compliance with any proposed minimum standards.
Author: John Michael Mounce Publisher: ISBN: Category : Reflective materials Languages : en Pages : 80
Book Description
The objective of this report is to give a preliminary assessment of the impact that revised retroreflectivity requirements will have on the State of Montana. Conclusions and recommendations are made future management and handling of sign inventory data in Montana. This objective is addressed through the following tasks: Task A: Review, assimilation and analyses of current literature available on a nationwide basis; Task B: Discussion of results from a multi state phone solicitation regarding state sign management practices and policies; Task C: An assessment of sign reflectivity inspection equipment and sampling methodology; and Task D: Evaluation of Montana sign inventory on the basis of current practices and condition of a limited sampling of signs. Recommendations of this report include upgrading of, or improvements to Montana Department of Transportation sign management system and multi-district statewide retroreflective sampling to better determine the impacts revised standards may have.
Author: National Research Council (U.S.). Transportation Research Board Publisher: ISBN: Category : Highway-railroad grade crossings Languages : en Pages : 116
Author: Denis P. Paradis
Author: Denis P. Paradis
Author: Travis Matthew Bergin
Author: Carly MacEacheron
Author: John Michael Mounce
Author: J. F. Paniati
Author: National Research Council (U.S.). Transportation Research Board
Author: 
Author: Gerardo W. Flintsch
Author: Hugh W. McGee
Author: R. E. Nordlund