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Author: Mustaffa Raja Publisher: ISBN: 9780438468474 Category : Mountain roads Languages : en Pages : 169
Book Description
Mountain passes increase the risk of a runaway, or out of control trucks. Advance warning signs inform the driver to take special precautions such as reducing speed or using lower gears during the descent. The Wyoming Department of Transportation has installed steep grade advance warning systems on Wyoming mountain passes. However, concerns for out of control trucks on mountain passes are still ongoing. Hence, a supplementary study is necessary to enhance safety and effectiveness of the preexisting warning systems. Quantitative data of truck crashes on downgrades throughout the state of Wyoming were investigated; five representative downgrades were selected for investigating the effectiveness of warning signs, namely, WY-22 (Teton Pass), WY-14 & 16 in the Bighorn Mountains, as well as WY-28 (South Pass). The purpose of this study is to explore the effectiveness of advanced warning signs on mountain pass downgrades with respect to truck-related crash events and to discuss a safety evaluation study of Wyoming mountain passes and to make recommendations for improving the warning systems used to alert drivers to take special precautions on steep downgrades. A propensity score was estimated in order to quantify the effectiveness of warning signs on downgrades. The study found that the estimated probability of a truck crash occurring on untreated sites is 1.3 higher than treated sites based on matching propensity scores. Individual sign types were also investigated by negative binomial modeling for truck and all vehicle crashes. Chevron and trucker warning signs were found to be significant predictors in decreasing the frequency of crashes. GIS maps of warning sign and truck crash hotspots were generated for areas selected by performance measures listed in HSM. These maps were used to analyze the current warning sign system and several recommendations from the MUTCD were given.
Author: Mustaffa Raja Publisher: ISBN: 9780438468474 Category : Mountain roads Languages : en Pages : 169
Book Description
Mountain passes increase the risk of a runaway, or out of control trucks. Advance warning signs inform the driver to take special precautions such as reducing speed or using lower gears during the descent. The Wyoming Department of Transportation has installed steep grade advance warning systems on Wyoming mountain passes. However, concerns for out of control trucks on mountain passes are still ongoing. Hence, a supplementary study is necessary to enhance safety and effectiveness of the preexisting warning systems. Quantitative data of truck crashes on downgrades throughout the state of Wyoming were investigated; five representative downgrades were selected for investigating the effectiveness of warning signs, namely, WY-22 (Teton Pass), WY-14 & 16 in the Bighorn Mountains, as well as WY-28 (South Pass). The purpose of this study is to explore the effectiveness of advanced warning signs on mountain pass downgrades with respect to truck-related crash events and to discuss a safety evaluation study of Wyoming mountain passes and to make recommendations for improving the warning systems used to alert drivers to take special precautions on steep downgrades. A propensity score was estimated in order to quantify the effectiveness of warning signs on downgrades. The study found that the estimated probability of a truck crash occurring on untreated sites is 1.3 higher than treated sites based on matching propensity scores. Individual sign types were also investigated by negative binomial modeling for truck and all vehicle crashes. Chevron and trucker warning signs were found to be significant predictors in decreasing the frequency of crashes. GIS maps of warning sign and truck crash hotspots were generated for areas selected by performance measures listed in HSM. These maps were used to analyze the current warning sign system and several recommendations from the MUTCD were given.
Author: Milhan Moomen Publisher: ISBN: 9781687965295 Category : Mountain roads Languages : en Pages : 224
Book Description
The state of Wyoming like other western states is characterized by steep downgrades on mountainous highways. These downgrades present considerable crash risks to drivers of trucks and other heavy vehicles inexperienced or unfamiliar with the challenging terrain. This has resulted in crashes that have had devastating consequences on lives and property. A major contributory factor to truck crashes on mountain passes has been brake failure due to heating. The risk of truck brake failure on downgrades is high due to the large amounts of heat energy that have to be absorbed by the brake system. The Grade Severity Rating System (GSRS) was developed in the early 1980s to enhance truck safety on downgrades by recommending maximum safe descent speeds through Weight Specific Speed (WSS) signs. However, truck designs, brake and engine characteristics have changed during the intervening decades since the development of the GSRS. This has warranted updating the GSRS to reflect current truck characteristics. The GSRS model parameters were updated using field testing as part of this research. Validation tests conducted indicated the updated GSRS can recommend descent speeds that reduce the risk of brake failure. The second part of the research related to evaluating the safety effectiveness of downgrade warning signs as well as identifying factors impacting truck crash frequency/severity on mountain passes. The analysis showed that downgrade warning signs installed on mountain passes in the state are effective. A survey of intelligent transportation system (ITS) technologies identified applications that may be adopted to improve warning sign effectiveness. The results of the analyses also indicated that different factors including driver, vehicle, downgrade, and traffic characteristics influence crash frequency and severity on mountain passes. Suitable countermeasures were proposed to reduce crash frequency/severity. Implementation of the findings and recommendations from this research will engender driver compliance and confidence in the new advisory speeds, thereby improving mountain pass safety. Stakeholders that may benefit from this study include the Wyoming Highway patrol, Wyoming Department of Transportation (WYDOT), trucking companies and the general public.
Author: William D. Berg Publisher: ISBN: Category : Railroad crossings Languages : en Pages : 68
Book Description
The report presents the findings and conclusions of a study to develop an experimental design and analysis plan for field testing and evaluation of the accident reduction potential of a proposed new railroad grade crossing advance warning sign. Several alternative sampling frameworks were initially developed to determine which might offer the most efficient design in terms of required sample size. The cost of undertaking the field studies and analyses was then evaluated so that it could be compared to the expected value or utility of the information to be derived from the study. The results indicated that the proposed accident study would be both experimentally and economically impractical. It was therefore recommended that an accident study not be undertaken. Several policy options were then examined.
Author: Wm. D. Berg Publisher: ISBN: Category : Languages : en Pages : 63
Book Description
"Abstract: This report presents the findings and conclusions of a study to develop an experimental design and analysis plan for field testing and evaluation of the accident reduction potential of a proposed new railroad grade crossing advance warning sign. Several alternative sampling frameworks were initially developed to determine which might offer the most efficient design in terms of required sample size. because of the very large sample sizes associated with the alternative sampling frameworks, an analysis was undertaken to determine the minimum relative reduction in accident rate which would economically justify deployment of the new advance warning sign. The cost of undertaking the field studies and analyses was then evaluated so that it could be compared to the expected valye or utility of the information to be derived from the study. The results indicated that the proposed accident study would be both experimentally and economically impractical. It was therefore recommended that an accident study not be undertaken. Several policy options were then examined."--Technical report documentation page.
Author: Ken Skorseth Publisher: ISBN: Category : Gravel roads Languages : en Pages : 112
Book Description
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
Author: Mustaffa Raja
Author: Mustaffa Raja
Author: Milhan Moomen
Author: William D. Berg
Author: William D. Berg
Author: W. D. Berg
Author: Wm. D. Berg
Author: Ken Skorseth
Author: David J. Welch
Author: United States. Bureau of Motor Carrier Safety
Author: Florida. Governor's Highway Safety Commission