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Dissertations / Theses on the topic 'Severity of hypothetical crash'

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Published: 4 June 2021

Last updated: 6 February 2022

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1

Alfallaj, Ibrahim Saleh. "Analysis of Crash Location and Crash Severity Related to Work Zones in Ohio." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406912337.

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2

Dias, Ishani Madurangi. "Work zone crash analysis and modeling to identify factors associated with crash severity and frequency." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20517.

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Doctor of Philosophy<br>Civil Engineering<br>Sunanda Dissanayake<br>Safe and efficient flow of traffic through work zones must be established by improving work zone conditions. Therefore, identifying the factors associated with the severity and the frequency of work zone crashes is important. According to current statistics from the Federal Highway Administration, 2,372 fatalities were associated with motor vehicle traffic crashes in work zones in the United States during the four years from 2010 to 2013. From 2002 to 2014, an average of 1,612 work zone crashes occurred in Kansas each year, ma

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3

Sharma, Aasha Turochy Rod E. "Hypothetical analysis on cost effectiveness of centerline rumble strips as a crash countermeasure." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/SHARMA_ASHA_54.pdf.

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4

Wang, Zhenyu. "Modeling crash severity and speed profile at roadway work zones." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002515.

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5

Wang, Qing. "Study on crash characteristics and injury severity at roadway work zones." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002924.

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6

Nevarez-Pagan, Alexis. "SEVERITY ANALYSIS OF DRIVER CRASH INVOLVEMENTS ON MULTILANE HIGH SPEED ARTERIAL CORRIDORS." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3478.

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Arterial roads constitute the majority of the centerline miles of the Florida State Highway System. Severe injury involvements on these roads account for a quarter of the total severe injuries reported statewide. This research focuses on driver injury severity analysis of statewide multilane high speed arterials using crash data for the years 2002 to 2004. The first goal is to test different ways of analyzing crash data (by road entity and crash types) and find the best method of driver injury severity analysis. A second goal is to find driver, vehicle, road and environment related factors tha

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7

Caviedes, Cómbita Àlvaro Alfonso. "Exploring the Determinants of Vulnerable Road Users' Crash Severity in State Roads." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/4062.

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Pedestrians and bicyclists are the most vulnerable road users and suffer the most severe consequences when crashes take place. An extensive literature is available for crash severity in terms of driver safety, but fewer studies have explored non-motorized users' crash severity. Furthermore, most research efforts have examined pedestrian and bicyclist crash severity in urban areas. This study focuses on state roads (mostly outside major urban areas) and aims to identify contributing risk factors of fatal and severe crashes involving pedestrians and bicyclists in state roads. Two ordinal regress

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8

Mohagheghi, Ali. "Effect of Pavement Condition on Traffic Crash Frequency and Severity in Virginia." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/100129.

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Previous studies show that pavement condition properties are significant factors to enhance road safety and riding experience, and pavements with low quality might have inadequate performance in terms of safety and riding experience. Pavement Management System (PMS) databases include pavement properties for each segment of the road collected by the agencies. Understanding 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), A

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9

Angel, Alejandro. "Estimating Injury Severity and Cost in Two-Vehicle Crashes." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195748.

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This dissertation performs a comprehensive analysis of the effect of different environmental, demographic and vehicle variables on the severity of two-vehicle crashes. The limitations associated with previous studies have been addressed by using a large crash database, properly defining the independent variables, using appropriate statistical models, and by considering the effect of factors normally unaccounted for such as crash type, impact speed, and weight or height incompatibilities between the two vehicles.The use of multinomial logit models at the individual occupant and crash levels pro

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10

EKRAM, AL-AHAD. "REDUCED VISIBILITY RELATED CRASHES IN FLORIDA: CRASH CHARACTERISTICS, SPATIAL ANALYSIS AND INJURY SEVERITY." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4306.

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Roadway crashes related to vision obstruction due to fog/smoke (FS) conditions constitute a challenge for traffic engineers. Previous research efforts mostly concentrated on the snow and rain related crashes. Statistics show that Florida is among the top three states in terms of crashes due to vision obstruction by FS. This research culminated in a comprehensive study of fog and smoke related crashes in the state of Florida. The analysis took into account the crashes that occurred between 2003 and 2007 on Florida state roads. Spatial analysis and injury severity analysis have been conducted an

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11

Ekram, Al-Ahad Mohammad Yaseen. "Reduced visibility related crashes in Florida crash characteristics, spatial analysis and injury severity /." Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002903.

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12

Seat, Conor Judd. "Crash Severity Distributions for Life-Cycle Benefit-Cost Analysis of Safety-Related Improvements on Utah Roadways." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6875.

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The Utah Department of Transportation developed life-cycle benefit-cost analysis spreadsheets that allow engineers and analysts to evaluate multiple safety countermeasures. The spreadsheets have included the functionality to evaluate a roadway based on the 11 facility types from the Highway Safety Manual (HSM) with the use of crash severity distributions. The HSM suggests that local agencies develop crash severity distributions based on their local crash data. The Department of Civil and Environmental Engineering at Brigham Young University worked with the Statistics Department to develop cras

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13

Katta, Vanishravan. "Development of Crash Severity Model for Predicting Risk Factors in Work Zones for Ohio." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1384556981.

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14

Sameera, Chathuranga Koththigoda Kankanamge. "Crash analysis and road user survey to identify issues and countermeasures for older drivers in Kansas." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35452.

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Master of Science<br>Department of Civil Engineering<br>Sunanda Dissanayake<br>The percentage of the U.S. population aged 65 years or older is increasing rapidly. Statistics also show this age group was 14.9 percent of the population in 2015 and is expected to be 20.7 to 21.4 percent for the years 2030–2050. Kansas has similar statewide trends with its aging population. Therefore, identifying issues, concerns, and factors associated with severity of older-driver crashes in Kansas is necessary. The Kansas Crash Analysis and Reporting System (KCARS) database maintained by Kansas Department of Tr

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15

Alshehri, Abdulaziz Hebni. "Analysis of Factors Affecting Crash Severity of Pedestrian and Bicycle Crashes Involving Vehicles at Intersections." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1511983249414075.

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16

Ulfarsson, Gudmundur Freyr. "Injury severity analysis for car, pickup, sport utility vehicle and minivan drivers : male and female differences /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/10200.

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17

Alqahtani, Thaar S. "Investigation of Characteristics and Assessment of Crash Severity Factors Associated With Truck-Related Crashes in Ohio." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1464107995.

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18

Chowdhury, Panini Amin. "Identifying the Factors and Locations of Traffic Crash Severity of Dhaka Metropolitan Area, Bangladesh, 2007-2011." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo15380514492171.

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19

Wang, Xuesong. "SAFETY ANALYSES AT SIGNALIZED INTERSECTIONS CONSIDERING SPATIAL, TEMPORAL AND SITE CORRELATION." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3436.

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Statistics show that signalized intersections are among the most dangerous locations of a 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 identify the significant factors contributing to crashes, this dissertation investigated the temporal, spatial, and site correlations for total, rear-end, right-angle and left-turn crashes. Using the basic regression

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20

Moore, Darren N. "Mixed Multinomial Logit Analysis of Bicyclist Injury-severity in Single Motor Vehicle Crashes Based on Intersection and Non Intersection Locations." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247599441.

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21

Bendall, William Bryson. "Retrospective Analysis of Injuries Sustained In Vehicle Front‐ and Back‐Overs in a Level I Pediatric Trauma Center." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/623628.

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A Thesis submitted to The University of Arizona College of Medicine - Phoenix in partial fulfillment of the requirements for the Degree of Doctor of Medicine.<br>Motor vehicle accidents involving pedestrians are some of the most common and lethal forms of injury for children in the United States. Among younger children, a common mechanism of action for severe trauma is when a vehicle runs over the child in a forward or backward motion at low speed resulting in a blunt crush injury. This typically occurs in non‐traffic settings including driveways, sidewalks, and roadways. Such incidents have b

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22

Pai, Chih-Wei. "An analysis of motorcyclist injury severity by various crash configurations at T-junctions in the United Kingdom." Thesis, Edinburgh Napier University, 2008. http://researchrepository.napier.ac.uk/Output/6200.

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Motorcyclists that have no protective structures while motorcycling as other occupants of automobiles do can be particularly vulnerable to accident injuries (i.e., motorcycles are not as crashworthy as automobiles). Motorcyclists' susceptibility to accident injuries in nature may act synergistically with the complexity of conflicting manoeuvres between motorcycles and other motor vehicles to increase their injury severities in accidents that take place at junctions (e.g., T-junction or crossroad). Previous studies have applied crash prediction models to investigate influential factors on the o

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23

Altwaijri, Saleh. "Analysing traffic crashes in Riyadh City using statistical models and geographic information systems." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12556.

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Road safety is a serious societal concern in Riyadh city, Kingdom of Saudi Arabia. Because of the negative impact of traffic crashes which cause losses in the form of deaths, injuries and property damage, in addition to the pain and social tragedy affecting families of the victims, it is important for transport policy makers to reduce their impact and increase safety standards by reducing the severity and frequency of crashes in the city of Riyadh. It is therefore important to fully understand the relationship between traffic crash severity and frequency and their contributing factors so to es

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24

Kotikalapudi, Siddhartha. "Characteristics and contributory causes related to large truck crashes (phase-II) - all crashes." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/14027.

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Master of Science<br>Department of Civil Engineering<br>Sunanda Dissanayake<br>In order to improve safety of the overall surface transportation system, each of the critical areas needs to be addressed separately with more focused attention. Statistics clearly show that large-truck crashes contribute significantly to an increased percentage of high-severity crashes. It is therefore important for the highway safety community to identify characteristics and contributory causes related to large-truck crashes. During the first phase of this study, fatal crash data from the Fatality Analysis Reporti

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25

Ydenius, Anders. "Integration of car and road infrastructure design : crash severity and occupant injury risk evaluations in frontal real-world crashes /." Stockholm, 2010. http://diss.kib.ki.se/2010/978-91-7409-534-0/.

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26

Kwong, Tse-hin Glenn, and 鄺子憲. "An autopsy-based epidemiological study of road traffic fatalities in Hong Kong: crash type, injury severity andprospects for intervention." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31228252.

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27

Wang, Chunyan. "Fatal crash trends and analysis in southeastern states." Diss., Georgia Institute of Technology, 2006. http://etd.gatech.edu/theses/available/etd-04092006-023047/.

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Thesis (Ph. D.)--Georgia Institute of Technology, 2006.<br>Includes bibliographical references (p. 209-211). Also available online via the Georgia Institute of Technology ETD website (http://etd.gatech.edu/).

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28

Almonte-Valdivia, Ana. "Level-of-Service and Traffic Safety Relationship: An Exploratory Analysis of Signalized Intersections and Multiland High-Speed Arterial Corridors." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3372.

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Since its inception in 1965, the Level-of-Service (LOS) has proved to be an important and practical "quality of service" indicator for transportation facilities around the world, widely used in the transportation and planning fields. The LOS rates these facilities' traffic operating conditions through the following delay-based indicators (ordered from best to worst conditions): A, B, C, D, E and F. This LOS rating has its foundation on quantifiable measures of effectiveness (MOEs) and on road users' perceptions; altogether, these measures define a LOS based on acceptable traffic operating cond

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29

Ouedraogo, Nayabtigungu Hendrix. "The Safety Impact of Raising Trucks' Speed Limit on Rural Freeways in Ohio." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1576248242725121.

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30

Gonzalez-Velez, Enrique. "Safety Evaluation of Roadway Lighting Illuminance Levels and its Relationship with Nighttime Crash Injury Severity for West Central Florida Region." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3122.

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The main role of roadway lighting is to produce quick, accurate and comfortable visibility during nighttime conditions. It is commonly known that good lighting levels enable motorists, pedestrians and bicyclists to obtain necessary visual information in an effective and efficient manner. Many previous studies also proved that roadway lighting minimizes the likelihood of crashes by providing better visibility for roadway users. Appropriate and adequate roadway lighting illuminance levels for each roadway classification and pedestrian areas are essential to provide safe and comfortable usage. Th

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31

Das, Abhishek. "Analyses of Crash Occurence and Injury Severities on Multi Lane Highways Using Machine Learning Algorithms." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2576.

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Reduction of crash occurrence on the various roadway locations (mid-block segments; signalized intersections; un-signalized intersections) and the mitigation of injury severity in the event of a crash are the major concerns of transportation safety engineers. Multi lane arterial roadways (excluding freeways and expressways) account for forty-three percent of fatal crashes in the state of Florida. Significant contributing causes fall under the broad categories of aggressive driver behavior; adverse weather and environmental conditions; and roadway geometric and traffic factors. The objective of

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32

Kullgren, Anders. "Validity and reliability of vehicle collision data : crash pulse recorders for impact severity and injury risk assessments in real-life frontal impacts /." Stockholm, 1998. http://diss.kib.ki.se/1998/91-628-3280-8/.

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33

Dowell, Ashley Lynn. "Evaluating the Safety Effects of Signal Improvements." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3575.

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As a result of high crash frequencies on roadways, transportation safety has become a high priority for the United States Department of Transportation and the Utah Department of Transportation. A large percentage of fatal and injury crashes on roadways occur at intersections and traffic signals have been implemented to reduce these severe crashes. There is a need to evaluate the effectiveness of the traffic signal improvements through the development of Crash Modification Factors (CMFs). Recent research has shown that traditional safety evaluation methods have been inadequate in developing CMF

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34

Sparks, Jessica L. "Biomechanics of blunt liver injury relating internal pressure to injury severity and developing a constitutive model of stress-strain behavior /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1185909955.

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35

Lym, Youngbin. "Three essays on unveiling complex urban phenomena: toward improved understanding." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595283291505878.

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36

Shrestha, Pramen P., and Joseph Shrestha. "Factors Associated with Crash Severities in Built-up Areas Along Rural Highways of Nevada: A Case Study of 11 Towns." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/714.

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In 2014, 32,675 deaths were recorded in vehicle crashes within the United States. Out of these, 51% of the fatalities occurred in rural highways compared to 49% in urban highways. No specific crash data are available for the built-up areas along rural highways. Due to high fatalities in rural highways, it is important to identify the factors that cause the vehicle crashes. The main objective of this study is to determine the factors associated with severities of crashes that occurred in built-up areas along the rural highways of Nevada. Those factors could aid in making informed decisions whil

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37

Keller, Joanne Marie. "ANALYSIS OF TYPE AND SEVERITY OF TRAFFIC CRASHES AT SIGNALIZED INTERSECTIONS USING TREE-BASED REGRESSION AND ORDERED PROBIT MODELS." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4382.

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Many studies have shown that intersections are among the most dangerous locations of a roadway network. Therefore, there is a need to understand the factors that contribute to traffic crashes at such locations. One approach is to model crash occurrences based on configuration, geometric characteristics and traffic. Instead of combining all variables and crash types to create a single statistical model, this analysis created several models that address the different factors that affect crashes, by type of collision as well as injury level, at signalized intersections. The first objective was to

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38

Andrade, Gustavo Riente de. "Relationship between traffic operations and road safety." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18144/tde-23012019-011508/.

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Since before the release of the Highway Safety Manual research has been indicating the need to incorporate mobility and control aspects to road safety analysis. The first part of this work developed and implement in an existing computational engine a signal timing optimization method that considers mobility, safety, and emissions measures simultaneously. A sensitivity analysis was conducted to provide insight on the practical effects and order of relevance of 20 key input variables. Mobility improvement performance usually coincides with emissions improvements, but sometimes at the expense of

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39

Amarasingha, Niranga. "Improving safety of teenage and young adult drivers in Kansas." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/14979.

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Doctor of Philosophy<br>Department of Civil Engineering<br>Sunanda Dissanayake<br>Young drivers have elevated motor vehicle crash rates compared to other drivers. This dissertation investigated characteristics, contributory causes, and factors which increase the injury severity of young driver crashes in Kansas by comparing them with more experienced drivers. Crash data were obtained from the Kansas Department of Transportation. Young drivers were divided into two groups: 15-19 years (teen) and 20-24 years (young adult) for a detailed investigation. Using data from 2006 to 2009, frequencies,

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Faden, Abdulrahman Khalid. "Development of Safety Performance Functions For Two-Lane Rural Highways in the State of Ohio." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1591976280554876.

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41

Allen, Charles G. "Crashes in the Vicinity of Major Crossroads." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2668.pdf.

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Christoforou, Zoi. "Incidence occurrence and response on urban freeways." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00626573.

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Research on road safety has been of great interest to engineers and planners for decades. Regardless of modeling techniques, a serious factor of inaccuracy - in most past studies - has been data aggregation. Nowadays, most freeways are equipped with continuous surveillance systems making disaggregate traffic data readily available ; these have been used in few studies. In this context, the main objective of this dissertation is to capitalize highway traffic data collected on a real-time basis at the moment of accident occurrence in order to expand previous road safety work and to highlight pot

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Angel, Michelle L. "The Effects of Rain on Traffic Safety and Operations on Florida Freeways." UNF Digital Commons, 2014. http://digitalcommons.unf.edu/etd/529.

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Although the association between weather and traffic variables or crash events appear intuitive to motorists, quantifying the effects that weather, especially rain, has on driver response in travel speeds, traffic demands, and susceptibility of accident occurrence is needed to evaluate practical aspects of traffic operations and safety measures. Previous studies have researched driver responses to inclement weather on roadways located primarily in northern and western regions of the United States (U.S.), Canada, and Europe. However, driver familiarity to local weather conditions is a factor th

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Issing, Matthias Michael. "Telematik und Telemedizin zur Verbesserung der präklinischen Notfallversorgung nach Straßenverkehrsunfällen." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2006. http://dx.doi.org/10.18452/15475.

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Die Überlebenswahrscheinlichkeit der Unfallopfer nach Straßenverkehrsunfällen hängt von der Zeitspanne vom Unfall bis zur ersten suffizienten Hilfeleistung (therapiefreies Intervall) sowie von der Qualität der Erstversorgung ab. Das therapiefreie Intervall kann durch automatische Notrufsysteme (ACN) und suffiziente Laienhilfe verkürzt werden. In dieser Dissertation werden (1) Modelle zur Prognose der Verletzungsschwere von Fahrzeuginsassen für den Einsatz in erweiterten automatischen Notrufsystemen (AACN) entwickelt und (2) Anforderungen an Telemedizinsysteme zur Unterstützung von Laien bei d

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(9375209), Cristhian Lizarazo Jimenez. "IDENTIFICATION OF FAILURE-CAUSED TRAFFIC CONFLICTS IN TRACKING SYSTEMS: A GENERAL FRAMEWORK." Thesis, 2020.

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<p><a>Proactive evaluation of road safety is one of the most important objectives of transportation engineers. While current practice typically relies on crash-based analysis after the fact to diagnose safety problems and provide corrective countermeasures on roads, surrogate measures of safety are emerging as a complementary evaluation that can allow engineers to proactively respond to safety issues. These surrogate measures attempt to address the primary limitations of crash data, which include underreporting, lack of reliable insight into the events leading to the crash, and long data colle

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Chen, Wei-Wen, and 陳尉雯. "Effects of Multi-level Risk Factors on Crash Severity." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/mc3zaq.

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碩士<br>國立交通大學<br>運輸與物流管理學系<br>103<br>Generalized linear models has been widely adopted in crash injury severity analysis, but ignored the hierarchical structures within accident data. However, the accidents happened at the same intersection are supposed to have common intersection factors (such as traffic, signal design, and facilities), indicates that the severity outcomes of these accidents are similar. In order to get more information from crash data and intersection investigation data, modeled crash injury severity analysis with intersection factors to compare the differences and causes of

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Ke, Chia-Yen, and 柯嘉彥. "Modeling Two-vehicle Crash Severity by Generalized Estimating Equations." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/5jdqmc.

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碩士<br>國立交通大學<br>運輸與物流管理學系<br>103<br>Most of previous studies in modeling two-vehicle crash severity levels use of univariate model which primary focus on the more serious injured party by ignoring the potential correlation between two parties, leading to the estimation bias. To overcome this problem, the other studies adopt bivariate models to accommodate the correlation and incorporate explanatory variables of two parties. However, the bivariate models tend to be too complex and have the problem of collinearity. Based on this, this study attempts to adopt generalized estimating equations (GEE

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Campbell, John R. "The use and impact of crash type and vehicle damage on intersection crash severity rankings." 2005. http://catalog.hathitrust.org/api/volumes/oclc/62521636.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2005.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 73-75).

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Liu, De-Cheng, and 劉得政. "Freeway crash frequency and severity modeling under optimal spatial segmentation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/17073315342407396245.

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碩士<br>國立交通大學<br>運輸與物流管理學系<br>101<br>Prior to modeing crash frequency and severity, it is an essential step to spatially divid the study roadway system into several segments. Traditional segmentation methods, such as fixed length method (e.g. segementaion at every 5km) and interchange segmentation method (a segment is formed by two adjacent interchanges). However, these segmentation methods are mostly subjectively and tend to result into high correlation problem among neighboring segments, making the observations fail to distribute independently and leading to an estimation bias. Based on this,

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Ou, Nai-Wei, and 歐乃維. "Effect of Work Zone on Freeway Crash Frequency and Severity." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/jvh552.

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碩士<br>國立交通大學<br>運輸與物流管理學系<br>105<br>Freeway safety issue has long been considered as the top priority to be improved because accidents not only cause serious losses of involved parties but also induce excessive traffic delays. Therefore, numerous studies have dedicated to investigate the key factor contributing to accidents and propose effective countermeasures accordingly. However, few studies examine the potential risk of work zone on crashes. Work zone may block lanes and interrupt traffic flow, causing potential risk to crashes. Based on this, this study aims to investigate the effects of

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