Evaluation Of Work Zone Crashes In California
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| Author | : Dheeraj Varma Lakamraju |
| Publisher | : |
| Total Pages | : 96 |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
Work zone crashes have been a major concern of safety for many government agencies and travelling public. According to Federal Highway Administration(FHWA) Fact & Statistics, there is need for maintenance, rehabilitation and advancement of existing road networks, which in turn lead to setup of large number of work zones throughout US which eventually impacts the regular traffic flow and safety. The main objective of this project was to find work zone crash characteristics and risk factors that affect the crash severity. For that purpose data relating to work zone crashes that occurred on all roadways in the state of California for the years 2011 to 2016 were obtained from Statewide Integrated Traffic Records System (SWITRS). A total of 12 variables with 45136 crashes were used to develop a crash severity model. The first step of the study was gathering literature on previous studies relating to work zone crash analysis. In the second step, the work zone crash data for each variable was analyzed based on crash severity and crash patterns were determined. In the third step, each variable was statistically analyzed to determine significant differences between the variable and the dependent variable using Pearson chi-square statistical test. A total of 10 variables out of 12 variables were found to have a significant relationship between the dependent variable. In the fourth step, a binary logistic regression model was used to determine significant predictors of fatal crashes. In this study, the independent variables such as location of crash, violation category, crash type, motor vehicle involved with, lighting condition, alcohol involved, and driver???s gender were found to be significant predictors of fatal crashes at work zones in the state of California for years 2011-2016.
| Author | : Andrew Tracey Malone |
| Publisher | : |
| Total Pages | : |
| Release | : 2013 |
| Genre | : |
| ISBN | : 9781303443282 |
The main purpose of this study is to scientifically assess the usefulness and cost effectiveness of Construction Zone Enhanced Enforcement Program (COZEEP) and Maintenance Zone Enhanced Enforcement Program (MAZEEP). These operations are a collaboration between California Department of Transportation (Caltrans) and California Highway Patrol (CHP). Vehicle collisions that occur near or in highway work zone areas can be expensive, cause injuries, and dramatically increase danger to road workers and the traveling public. This research focuses mainly on the injury cost benefit of using COZEEP/MAZEEP along with the severity and number reduction of accidents that occur in the proximity of work zones. The basis for this study is provided by comprehensive traffic collision reports in construction and maintenance zones that are collected throughout the Californian districts. From the gathered traffic collision reports, 100 collisions with direct involvement to the work site are selected for reconstruction using simulation software (PC-Crash). The selected collisions for analysis are chosen because there is either intrusion into the work zone or the collision involves construction property and results in injury. The analysis process consists of reconstructing the initial accident in PC-Crash. Then two conditions are placed on the simulated accident. First a 7 mph initial speed reduction is placed onto the simulation. The second condition is a 5 mph initial speed reduction placed onto the vehicles involved in the collision. Each outcome is then marked as "no change", "severity reduction", or "prevented".
| Author | : Warren E. Hughes |
| Publisher | : |
| Total Pages | : 112 |
| Release | : 2002 |
| Genre | : Quantitative research |
| ISBN | : |
This report presents the results of a study of reported crashes that occurred in selected work zones from four participating States: California, Maryland, Minnesota, and Washington. Candidate construction projects were identified by the State Transportation Agencies. Data on the location of the project, the start and end dates, the type of project, the type of highway, and other factors were compiled for each project. In addition, data on the work zone was also gathered. Crashes reported when the work zone was in effect and for the corresponding period before the construction project were identified and crash data were obtained. Analyses were undertaken to determine differences in crash rates during construction compared to before construction. The relative increase in rates was on the order of 25 to 50 percent for many of the projects and as much as 100 percent for some of the projects. In addition, an assessment of data elements for work zones and work zone crashes was conducted. Recommendations on a standardized definition for work zones and work zone crashes are proposed.
| Author | : Lance Heira Higa |
| Publisher | : |
| Total Pages | : 368 |
| Release | : 2012 |
| Genre | : Automobile driving at night |
| ISBN | : 9781267204295 |
Abstract: Accidents during nighttime construction are major concerns in urban areas. More data for nighttime work zone safety studies are needed to support the decision making process of construction operations. The main objective of this paper is to evaluate what type of accidents most frequently occur. This study focuses exclusively on nighttime construction zone accidents which occurred in Riverside and San Bernardino counties from 2006 to 2009. The data is analyzed using ANOVA and Regression analysis. The findings of the study indicate a driver is likely to be involved in a sideswipe, rear end, hit other object or overturn accident. The leading cause for the accident is speeding, making an illegal turn, or improper driving with the movement of the driver prior to the accident being traveling straight, stopped or marking a right turn. Nighttime construction accidents can be reduced with a better understanding and knowledge of how they occur.
| Author | : Bradley T. Hargroves |
| Publisher | : |
| Total Pages | : 58 |
| Release | : 1980 |
| Genre | : Roads |
| ISBN | : |
| Author | : Henry Brown |
| Publisher | : |
| Total Pages | : 136 |
| Release | : 2016 |
| Genre | : Road work zones |
| ISBN | : |
The Highway Safety Manual (HSM) is the compilation of national safety research that provides quantitative methods for analyzing highway safety. The HSM presents crash modification functions related to freeway work zone characteristics such as work zone duration and length. These crash modification functions were based on freeway work zones with high traffic volumes in California. When the HSM-referenced model was calibrated for Missouri, the value was 3.78, which is not ideal since it is significantly larger than 1. Therefore, new models were developed in this study using Missouri data to capture geographical, driver behavior, and other factors in the Midwest. Also, new models for expressway and rural two-lane work zones that barely were studied in the literature were developed. A large sample of 20,837 freeway, 8,993 expressway, and 64,476 rural two-lane work zones in Missouri was analyzed to derive 15 work zone crash prediction models. The most appropriate samples of 1,546 freeway, 1,189 expressway, and 6,095 rural two-lane work zones longer than 0.1 mile and with a duration of greater than 10 days were used to make eight, four, and three models, respectively. A challenging question for practitioners is always how to use crash prediction models to make the best estimation of work zone crash count. To solve this problem, a user-friendly software tool was developed in a spreadsheet format to predict work zone crashes based on work zone characteristics. This software selects the best model, estimates the work zone crashes by severity, and converts them to monetary values using standard crash estimates. This study also included a survey of departments of transportation (DOTs), Federal Highway Administration (FHWA) representatives, and contractors to assess the current state of the practice regarding work zone safety. The survey results indicate that many agencies look at work zone safety informally using engineering judgment. Respondents indicated that they would like a tool that could help them to balance work zone safety across projects by looking at crashes and user costs.
| Author | : Jerry L. Graham |
| Publisher | : |
| Total Pages | : 104 |
| Release | : 1983 |
| Genre | : Roads |
| ISBN | : |
The study involves the development of an accident data reporting process for use in construction, maintenance, or utility work areas. The process is based on the results of a 9 state survey which collected information on practices and procedures which were in use in those states.
| Author | : California. Office of Traffic Safety |
| Publisher | : |
| Total Pages | : 582 |
| Release | : 1985 |
| Genre | : Traffic safety |
| ISBN | : |
| Author | : Bahram Ravani |
| Publisher | : |
| Total Pages | : 72 |
| Release | : 2013 |
| Genre | : Law enforcement |
| ISBN | : |
| Author | : Simon Washington |
| Publisher | : CRC Press |
| Total Pages | : 496 |
| Release | : 2020-01-30 |
| Genre | : Technology & Engineering |
| ISBN | : 0429520751 |
The book's website (with databases and other support materials) can be accessed here. Praise for the Second Edition: The second edition introduces an especially broad set of statistical methods ... As a lecturer in both transportation and marketing research, I find this book an excellent textbook for advanced undergraduate, Master’s and Ph.D. students, covering topics from simple descriptive statistics to complex Bayesian models. ... It is one of the few books that cover an extensive set of statistical methods needed for data analysis in transportation. The book offers a wealth of examples from the transportation field. —The American Statistician Statistical and Econometric Methods for Transportation Data Analysis, Third Edition offers an expansion over the first and second editions in response to the recent methodological advancements in the fields of econometrics and statistics and to provide an increasing range of examples and corresponding data sets. It describes and illustrates some of the statistical and econometric tools commonly used in transportation data analysis. It provides a wide breadth of examples and case studies, covering applications in various aspects of transportation planning, engineering, safety, and economics. Ample analytical rigor is provided in each chapter so that fundamental concepts and principles are clear and numerous references are provided for those seeking additional technical details and applications. New to the Third Edition Updated references and improved examples throughout. New sections on random parameters linear regression and ordered probability models including the hierarchical ordered probit model. A new section on random parameters models with heterogeneity in the means and variances of parameter estimates. Multiple new sections on correlated random parameters and correlated grouped random parameters in probit, logit and hazard-based models. A new section discussing the practical aspects of random parameters model estimation. A new chapter on Latent Class Models. A new chapter on Bivariate and Multivariate Dependent Variable Models. Statistical and Econometric Methods for Transportation Data Analysis, Third Edition can serve as a textbook for advanced undergraduate, Masters, and Ph.D. students in transportation-related disciplines including engineering, economics, urban and regional planning, and sociology. The book also serves as a technical reference for researchers and practitioners wishing to examine and understand a broad range of statistical and econometric tools required to study transportation problems.
