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Author: Muhammad Tahmidul Haq Publisher: ISBN: Category : Climbing lanes Languages : en Pages :
Book Description
I-80 in Wyoming is characterized by heavy truck traffic, with an average of 47 percent of heavy trucks in the traffic flow. This research analyzes the impacts of truck traffic along I-80 in Wyoming, as well as mitigation strategies to minimize negative impacts, through analyses of safety and operational implications that result from the interactions between trucks and other vehicles. Various traffic, geometrical, and weather characteristics were found significant to increase truck-related crashes, whereas the presence of climbing lanes was found to have potential safety and operational benefits. The analysis of occupant injury severity in passenger car-truck collisions shows that car drivers are more responsible than truck drivers contributing more severe injuries. The disaggregate modeling approach shows significant differences in both the combination and the magnitude of the impact of variables that justify the importance of examining the injury severity of truck-involved crashes broken down by vehicle types, truck configurations, and driving actions. The crash rate analysis shows a higher tire failure rate for trucks compared to the total tire failure rate considering equal vehicle miles traveled as exposure. Benefit-cost analysis for climbing lane installations indicates that the installation of climbing lanes has a significant potential to improve traffic performances for a 20-year planning horizon, with aggregated benefits significantly outperforming the corresponding costs. Findings from this study are expected to help the Wyoming Department of Transportation and policymakers take necessary actions in reducing truck-related crashes and improve the overall operational performance by targeting appropriate strategies and proper resource allocation.
Author: Muhammad Tahmidul Haq Publisher: ISBN: Category : Climbing lanes Languages : en Pages :
Book Description
I-80 in Wyoming is characterized by heavy truck traffic, with an average of 47 percent of heavy trucks in the traffic flow. This research analyzes the impacts of truck traffic along I-80 in Wyoming, as well as mitigation strategies to minimize negative impacts, through analyses of safety and operational implications that result from the interactions between trucks and other vehicles. Various traffic, geometrical, and weather characteristics were found significant to increase truck-related crashes, whereas the presence of climbing lanes was found to have potential safety and operational benefits. The analysis of occupant injury severity in passenger car-truck collisions shows that car drivers are more responsible than truck drivers contributing more severe injuries. The disaggregate modeling approach shows significant differences in both the combination and the magnitude of the impact of variables that justify the importance of examining the injury severity of truck-involved crashes broken down by vehicle types, truck configurations, and driving actions. The crash rate analysis shows a higher tire failure rate for trucks compared to the total tire failure rate considering equal vehicle miles traveled as exposure. Benefit-cost analysis for climbing lane installations indicates that the installation of climbing lanes has a significant potential to improve traffic performances for a 20-year planning horizon, with aggregated benefits significantly outperforming the corresponding costs. Findings from this study are expected to help the Wyoming Department of Transportation and policymakers take necessary actions in reducing truck-related crashes and improve the overall operational performance by targeting appropriate strategies and proper resource allocation.
Author: Muhammad Tahmidul Haq Publisher: ISBN: 9780438100312 Category : Climbing lanes Languages : en Pages : 131
Book Description
Roadway safety is of a primary concern for all stakeholders in the transportation industry, as well as the general public. A major use of the highway system is the movement of goods, and the trucking industry keeps on contributing fundamentally to the nation’s economy. Over the recent years, the United States has encountered steady development in the amount of freight transported by truck because of globalization, trade growth, and improvements in logistics and supply chain management. In 2012, 4 million tons of freight in United States were transported by trucks, which accounted for 68.5 percent of the total freight weight. This percentage is expected to continue to grow in the next ten years. Although these improvements have prompted financial development, there has been a sharp increase in the extent of cargo/truck movement going along key routes that has caused significant interactions between trucks and other vehicles. In 2016, over 4,300 people died in large truck related crashes in the United States. The number of motor vehicle fatalities increased by 1,976 in 2016 compared to 2015, which was about 5.6% increase. Among these motor vehicle occupants killed in traffic crashes, approximately 21% were due to truck-related crashes. The approximate average cost of a large-truck related crash was more than $91,000. Wyoming is also encountering an extensive increase in truck movement along Interstate 80 (I-80). The increased interactions between trucks and other vehicles have raised many operational and safety concerns along I-80. According to Wyoming Department of Transportation (WYDOT) annual crash report, 65% of fatal truck crash (medium and heavy truck) occurred on interstate highways of Wyoming in 2016, and 54% of these fatal crashes were observed on I-80 in Wyoming. On the other hand, the presence of heavy truck traffic degrades the operational performance of roadway system. According to the Highway Capacity Manual (HCM), passenger cars can negotiate upgrades of 4% to 5% without a noticeable loss in speeds maintained on level roadways. However, the performance of trucks is greatly affected by vertical grades. Trucks start losing their speeds at freeway grades of about 1%. Trucks generally decrease speed by more than 7% on upgrades as compared to their operation on level terrains. The reduction in truck speeds depends on the rate and length of grades, as summarized by the HCM. This causes a lot of friction between passenger cars and trucks on upgrades, with a noticeable difference in speeds. Also, because of the high truck percentage, it is very common for trucks to use the left lane, which causes a queue buildup behind them and leading to deteriorated traffic conditions. This study investigated the impacts of truck traffic on selected upgrades of freeway segments along I-80 in Wyoming and climbing lanes were considered as one of the potential mitigation strategies to enhance operational efficiency and safety. Cross-sectional analysis was adopted to evaluate the safety effectiveness of climbing lanes. Data were collected from different sources and Wyoming-specific Safety Performance Functions (SPFs) were developed using crash data from 2008 to 2016 for different severity levels and crash types. All the segments were selected from I-80 in Wyoming with climbing lanes as treatment sites, and segments with similar geometrical characteristics without climbing lanes as comparison sites. The Negative Binomial (NB) and Zero-Inflated Negative Binomial (ZINB) model were used to develop Wyoming-specific SPFs for I-80 as they were found to fit better for the crash data. The Crash Modification Factors (CMFs) for climbing lanes were found effective in reducing different severity levels and crash types. For operational analysis, a ten-mile eastbound segment along I-80 (MP 313 – MP 323) was chosen, and the traffic volume and roadway geometry associated with this segment were collected to evaluate the climbing lane efficiency for this specific segment. A combination of VISUM and VISSIM was applied to develop microsimulation model for both current and future (the year 2027 and 2037) traffic conditions at selected segment of I-80 corridor. It was found that the installation of climbing lanes has the potential to improve operational performances (average delay, total delay, total travel time, average speed) for a 10 and 20-year planning horizon.
Author: Mohammad Mahdi Rezapour Mashhadi Publisher: ISBN: 9780438403567 Category : Roads Languages : en Pages : 191
Book Description
Wyoming has one of the highest large truck crash rates in the country. This is due to a variety of reasons which include the significant amount of through truck traffic on I-80, adverse weather conditions, challenging geometric conditions, and the increased oil and gas production activities in the state. These factors have caused the Wyoming Highway Patrol (WHP) to allocate extensive resources on inspection of commercial vehicles and enforcement of traffic laws in the state. Because of the heavy truck traffic on Interstate 80, the WHP utilizes much of their resources patrolling and performing inspections. The focus of this research is to identify the primary factors behind the high truck crash rates in Wyoming and then develop mitigation strategies to reduce these high crash rates. A variety of datasets including: crash data, traffic volumes, traffic citations, roadway geometry, and enforcement data were used in this research. Various descriptive, statistical, and GIS methods were employed in this dissertation to identify the contributory factors to truck relate crashes. Based on the results, recommendations were given to the organizations in charge of truck safety in Wyoming. These organizations included: Wyoming Department of Transportation, Wyoming Highway Patrol and Wyoming trucking associations. The findings and recommendations are presented in nine papers that have been published or under review in various journals.
Author: Sahima Nazneen Publisher: ISBN: Category : Highway engineering Languages : en Pages : 0
Book Description
Road crashes have been a substantial concern for public highway agencies and societies for several decades. Traffic safety analysis is required to raise awareness about the effects of road crashes and traffic injuries and recommend the best measures to counter the occurrence of traffic crashes. The Wyoming Department of Transportation (WYDOT) is the main transportation agency responsible for traffic safety in the state. Traffic safety stakeholders and partner agencies in Wyoming rely on WYDOT for reliable and accurate data to fulfill their strategic goals of improving road safety. This study assessed the safety data needs of partner agencies by identifying gaps in the type and quality of safety data provided by WYDOT through a survey questionnaire and provided recommendations for WYDOT regarding road safety data reporting. Various human aspects, including but not limited to, age, gender, seatbelt nonuse, impaired driving, and speeding, play crucial roles in crash frequency and severity. In this regard, the objective of this study is to analyze human factors influencing road safety in Wyoming. To this end, this study explored the factors related to the seatbelt nonuse rate and children injured in traffic crashes in Wyoming. The research also focused on identifying factors that contribute to pedestrian injury severity, bicycle, motorcycle, and Commercial Motor Vehicle (CMV) injury crashes. The findings of this study provide new insights into enhancing traffic safety for WYDOT and other partner agencies by identifying appropriate countermeasures to mitigate the impact of human factors on crash injury severity as well as reduce the number of severe and fatal crashes.
Author: Rebecca Elise Franke Publisher: ISBN: 9781321063035 Category : Petroleum industry and trade Languages : en Pages : 90
Book Description
Roadway safety is an integral part of a functioning infrastructure. Many types of vehicles use the highway system for a variety of purposes, and each affects the roadways differently. Aside from commuter traffic and leisurely travel, a major use of the highway system is the transport of goods. These goods are typically transferred in large trucks. As supply and demand grows, the amount of trucks on the roadways needed to transport goods increases. The United States has experienced constant growth in the amount of freight transported by truck in the last few years. While overall national freight growth is constant, localized effects are more varied. Freight traffic may spike in areas based on events such as a new factory, or the discovery of a natural resource. These additions to a localized area can be taxing on the citizens and infrastructure, and the effect that truck traffic has on these areas may be more concentrated. The state of Wyoming has begun to experience a large increase in truck traffic on some of its local and county roads due to an increase in oil and gas production. The primary measure to evaluate the safety of a roadway is the number of crashes. This study addresses the effect that large truck traffic is having on the safety of various road sizes and classifications. For this study, large trucks are defined as vehicles weighing more than 26,000 pounds and the safety is measured by a crash's severity. An investigation on past literature revealed that many studies have been done on the factors involved in and the causation of heavy truck crashes, but none address the causation and effect the truck crashes have on different types of areas. Answers to this question may give transportation engineers guidelines on how to address truck safety in specific types of areas. A descriptive analysis of statewide crash data revealed many different trends in crashes. Most truck crashes occurred on interstates and primary federal highways. When road conditions were not clear, crashes more often occurred when snowy weather and icy roads were present. Heavy trucks were involved in multi-vehicle crashes less often than passenger vehicles. To verify some of the effects from the descriptive analysis, a logistic regression model was used to further explore the results. A localized study was also conducted to acquire better knowledge of the effect that trucks were having on local roads. This crash analysis focused on four counties in Eastern Wyoming and found that where truck traffic volumes have been increasing, so have crash rates in those counties.
Author: Arash Khoda Bakhshi Publisher: ISBN: Category : Interstate 80 Languages : en Pages : 342
Book Description
Traffic crashes impose a significant socio-economic cost on societies. According to the World Health Organization (WHO), 1.2 million people die every year, and more than 50 million people are injured due to fatal and non-fatal crashes globally. Safety concerns are more serious on rural corridors that play crucial roles in freight movement, such as Interstate 80 (I-80) in the State of Wyoming. Being affected by Wyoming’s adverse weather conditions, high altitude, challenging geometric characteristics, and critical traffic composition, there has been a notable crash and critical crash rate on 402-miles of this major freight corridor in Wyoming. To alleviate these safety concerns, the United States Department of Transportation Federal Highway Administration (USDOT FHWA) selected the Wyoming Department of Transportation (WYDOT) to deploy a Connected Vehicle (CV) Pilot Program along I-80 in Wyoming (WYDOT CV Pilot). The WYDOT CV Pilot focuses on the needs of the commercial vehicle operator and will develop CV applications to support a flexible range of services under Vehicular Ad-hoc Network (VANET), including roadside alerts, parking notifications, and dynamic travel guidance. In this regard, evaluation of the safety impacts of the CV Pilot is central to the USDOT’s strategic goals. The literature pointed out that the Market Penetration Rate (MPR) of CVs should be large enough to ensure safety and operational benefits of CVs. However, at early stages of the WYDOT CV Pilot, CVs will be contributing to a small fraction of the entire traffic stream, challenging traditional safety performance evaluation methodologies to assess the effectiveness of the CV technology. With these concerns, a comprehensive Analysis, Modeling, and Simulation (AMS) framework in addition to reliable baseline Analyses are required to scrutinize the safety performance of CVs under various MPR. These requirements have been fulfilled in this research through the use of advanced statistical modeling, Machine Learning, Deep Learning, data mining techniques, data visualization, and taking practical advantages of simulation- and driving simulator-based analyses. In the developed baseline and under the concept of Real-Time Risk Assessment (RTRA), significant real-time traffic-related variables contributing to crash and critical crash occurrences on the 402-miles I-80 in Wyoming during CV pre-deployment were identified. Using advanced statistical modeling and data visualization tools provided by Machine Learning techniques, the causal effect of these significant factors on the crash/ critical crash probabilities were explored. These causations are expected to be affected due to CV technology under notable MPRs in the future. Accordingly, the conducted baseline will be used as a benchmark against explored crash causations during CV post-deployment to grasp how this technology alleviates or changes the causality patterns, revealing the WYDOT CV Pilot safety performance. Furthermore, based on the preprocessed real-time traffic observation from the RTRA, the research calibrated and validated a reliable AMS framework to assess the safety effectiveness of the WYDOT CV Pilot that mainly goes around level-0 and level-1 of automated driving systems. At these levels, drivers are in charge of the execution of steering, acceleration/deceleration, and monitoring of the driving environment; thus, the human factor contributing to more than 90% of traffic crashes is still in that safety loop. Having said that, the AMS framework primarily aims to show how various CV applications, designed under WYDOT CV Pilot, would alter CV drivers’ behavior under traffic critical safety events and measure the effect of this alteration on I-80 traffic safety performance. Accordingly, drivers' behavioral alterations due to CV notification were quantified under the concept of with/without analysis and in a series of comprehensive high-fidelity driving simulator experiments conducted at the University of Wyoming Driving Simulator Lab (WyoSafeSim). These quantifications were analyzed separately and were conflated with traffic microsimulation modeling to reveal the safety effects of CV technology on the I-80 traffic stream under varying CV MPRs. This dissertation's findings and insights would be of interest to the WYDOT, the USDOT FHWA, and practitioners in the safety domain. The provided crowd-sourced real-time traffic dataset in the conducted baseline would help the WYDOT in understanding the current safety performance of I-80, identifying black-spot points in high-risk I-80 segments, and developing proactive countermeasures and interventions for Active Traffic Management (ATM) to alleviate the risk of traffic crashes on this major freight corridor. The data-driven crowdsourcing procedure performed on the AMS framework would shed some light on realizing the impact of CV technology on enhancing drivers’ situational awareness and minimizing the rate of motor vehicle crashes, which is not limited to I-80 in Wyoming. The integration of a high-fidelity driving simulator with traffic microsimulation modeling, as a two-pronged approach applied in the AMS framework, would show a fruitful pathway for the safety performance assessment of other CV pilots deployed by the FHWA with small CV MPRs at early deployment stages. Besides, beyond the main scope of assessing CV applications designed for WYDOT CV Pilot, the developed AMS framework could be utilized to evaluate the safety effect of other CV applications, such as the application of CV Variable Speed Limit (VSL) on lengthy rural corridors for the sake of spatiotemporal speed harmonization. The developed Road Weather Connected Vehicle Applications AMS framework was further extended by incorporating driver behavior and performance in adverse weather conditions utilizing a comprehensive Naturalistic Driving Study (NDS) dataset from the second Strategic Highway Research Program (SHRP2). The developed AMS framework could be helpful for a wide array of safety and operations of the next generation active traffic management.
Author: R. F. Benekohal Publisher: ISBN: Category : Roads Languages : en Pages : 82
Book Description
This study was conducted to determine the truck drivers' travel characteristics, concerns about work zone traffic control devices, and assessment of work zone features, as well as to determine the location of accidents and bad driving situations based on the experiences and perceptions of truck drivers. A statewide survey of semi-truck drivers was conducted in 6 locations in Illinois. The questionnaire contained 43 questions about truck drivers and travel characteristics, drivers' assessment of work zone features and traffic control devices, their accident and bad driving situation experiences, and their suggestions for improving traffic flow and safety in the work zones. About 930 truck drivers participated in the survey, and the responses from 834 of them were found suitable for further data analysis. The frequency of the responses to each question were analyzed. Also correlation analyses were conducted to identify the relationships among the surveyed questions. Different statistical tests were used for data analysis. Volume II of the final report, contains a detailed report of the study, including all of the information that is included in Volume I, which contains the summary of findings, conclusions, and recommendations.
Author: Khaled Ksaibati Publisher: ISBN: Category : Gravel roads Languages : en Pages : 266
Book Description
SAFETEA-LU contains language indicating that state department of transportation (DOTs) will be required to address safety on local and rural roads. It is important for state, county, and city officials to cooperate in producing a comprehensive safety plan to improve their statewide safety. This legislation provides an opportunity to implement a more cohesive and comprehensive approach to local road safety in Wyoming. The Wyoming Local Technical Assistant Program (LTAP) coordinated an effort in cooperation with the Wyoming Department of Transportation (WYDOT) as well as Wyoming counties and cities to identify low cost safety improvements on righ risk rural roads in Wyoming. In this project, safety techniques and methodologies were developed to identify and then rank high risk locations on rural roadways in Wyoming. What makes this project unique is the high percentage of gravel roads at the local level in Wyoming. The evaluation procedure developed is based on historical crash records and field evaluations. The main objective of this research was to develop and evaluate transportation safety techniques that can help Wyoming agencies in reducing crashes and fatalities on rural roads statewide. Three Wyoming counties were included in the pilot study. The statewide implementation began in 2009. This report describes the findings and recommendations of this research study, which would be very beneficial not only in Wyoming but also to those states interested in implementing a High Risk Rural Road (HRRR) Program.
Author: Muhammad Tahmidul Haq
Author: Muhammad Tahmidul Haq
Author: Muhammad Tahmidul Haq
Author: Mohammad Mahdi Rezapour Mashhadi
Author: Sahima Nazneen
Author: Rebecca Elise Franke
Author: Arash Khoda Bakhshi
Author: 
Author: 
Author: R. F. Benekohal
Author: Khaled Ksaibati