Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"crash frequency"”.
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Effect of Pavement Condition on Traffic Crash Frequency and Severity in Virginia
… the impact of road characteristics on crash frequency is a key step to prevent crashes. Whereas other studies analyzed the effect of different characteristics such as International Roughness Index (IRI), Rutting Depth (RD), Annual Average Daily Traffic (AADT), this thesis analyzed the …
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Methodology to estimate crash frequency at highway-rail grade crossings in a connected vehicle environment
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Optimal speed limit for shared-use roadways
Motor vehicle crashes are a serious social problem in the United States. Each year a large number of motor vehicle crashes occur and many people are killed or injured, resulting in substantial economic costs. To minimize economic costs, it is necessary to determine optimal speed limits on roadways …
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Spatio-Temporal Analysis of Highway Congestion and Accidents: A Case Study of Interstate 285 in Georgia
<p>Road traffic crashes threaten thousands of drivers every day and significant efforts have been put forth to reduce the number of traffic crashes and their impact. Traffic congestion could be both a result of and a contributing factor to traffic crashes. The aim of this study is to investigate …
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Influence of Street Trees on Frequency of Vehicle Collisions in Seattle
… between street trees and motor vehicle crash frequency in Seattle, WA, focusing on the implications for livability and safety. While previous literature initially suggests a potential negative relationship between trees and crashes, the present study finds no significant correlation in …
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A STUDY OF SAFETY IMPACTS OF DIFFERENT TYPES OF DRIVEWAYS AND THEIR PROXIMITY
… having less than 50 parking spaces. The HSM crash prediction models require the inputs of driveway type and density. However, the actual impacts of different types of driveways on the number of crashes are not clear. The crash modification factors were provided based on few past studies, with …
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A New Approach To Identify The Expected Crash Patterns Based On Signalized Intersection Size And Analysis Of Vehicle Movements
Analysis of intersection crashes is a significant area in traffic safety research. This study contributes to the area by identifying traffic-geometric characteristics and driver demographics that affect different types of crashes at signalized intersections. A simple methodology to estimate crash …
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Applying Log-linear Models And GIS To Study The Safety Of Pedestrians And Bicyclists : A Case Study Of Orange County School Children
… assess their importance in pedestrian/bicycle crashes occurring in and around school zones. The current study is an endeavor in this direction. The literature review identified some studies that were conducted on school zone safety related to pedestrian/bicyclist crashes. Most of the studies …
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Assessing Crash Occurrence On Urban Freeways Using Static And Dynamic Factors By Applying A System Of Interrelated Equations
Traffic crashes have been identified as one of the main causes of death in the US, making road safety a high priority issue that needs urgent attention. Recognizing the fact that more and effective research has to be done in this area, this thesis aims mainly at developing different statistical …
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Integrating Novel Connected Vehicle Event Data for Proactive Road Safety Improvement
… road safety, fatalities and injuries from road crashes continue to pose a major public health concern globally. This dissertation explored the integration of novel Connected Vehicle (CV) hard braking event (HBE) data for proactive road safety improvement. It comprised four distinct but related …
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Safety Evaluation of Freeway Exit Ramps
… the different factors contributing to the crashes happening on the exit ramp sections. To achieve the research objectives, the research team investigated crash history at 424 sites throughout Florida. The study area includes two parts, the freeway diverge area and the exit ramp sections. …
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Performance assessment of road barriers in Indiana
… of three components: 1) the effect on the crash frequency (segment level), 2) the effect on the probabilities of hazardous events (crash level), and 3) the effect on the probabilities of injury outcomes (occupant level). Crash costs, as a measure of overall safety performance, were finally …
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Safety Analyses At Signalized Intersections Considering Spatial, Temporal And Site Correlation
… roadway network. Different approaches including crash frequency and severity models have been used to establish the relationship between crash occurrence and intersection characteristics. In order to model crash occurrence at signalized intersections more efficiently and eventually to better …
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Traffic Safety Assessment of Different Toll Collection Systems on Expressways Using Multiple Analytical Techniques
… important issues in the transportation field. Crashes have caused extensive human and economic losses. With the objective of reducing crash occurrence and alleviating crash injury severity, major efforts have been dedicated to reveal the hazardous factors that affect crash occurrence. With …
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A machine learning model for vehicle crash type prediction
… the studies of risk factor investigation, crash detection, and crash frequency prediction. However, the existing studies are focused on the macro level, paying little attention to the specific crash type. In this study, eXtreme Gradient Boosting (XGBoost) method is applied to predict the …
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Pedal Misapplication: Past, Present, and Future
… 1. Identify and analyze multiple samples of PM crashes from a variety of data sources using both established and novel methods to gain new insight into the characteristics and frequency of PM crashes. 2. Use the confirmed, real-world PM crash data to develop a custom vehicle dynamics simulation …
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Safety analysis of freeway interchange speed change lane facilities
… segment. One study found that 36 percent of all crashes at a freeway interchange occur as drivers enter the freeway, and 53 percent of all crashes at a freeway interchange occur as divers exit the freeway. The same study also reported that freeway interchanges witness higher crashes per mile than …
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Evaluating the Impact of Access Density on Pedestrian and Bicycle Safety
… of access density on pedestrian and bicycle crash rates in urban areas of Florida. Access management, defined as the strategic control of vehicular access points along roadways, plays a crucial role in mitigating conflicts between various roadway users. Previous research has established a …
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Order Behavior In High Frequency Markets
… the causes, and effects of intraday flash crashes. Breakdowns in financial markets occur when the market is not able to facilitate its principal responsibilities of liquidity provision and price discovery. In this paper we look at flash crashes, a special type of market breakdown. These …
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Calibration of the Highway Safety Manual and development of new safety performance functions for rural multilane highways in Kansas
… roadways in Kansas. In recent years, rural fatal crashes have accounted for about 66% of all fatal crashes. The Highway Safety Manual (HSM) provides models and methodologies for analyzing the safety of various types of highways. Predictive methods in the HSM were developed based on national trends …
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