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Articles 91 - 103 of 103
Full-Text Articles in Transportation Engineering
Traffic Conflict Analysis Under Fog Conditions Using Computer Simulation, Binya Zhang
Traffic Conflict Analysis Under Fog Conditions Using Computer Simulation, Binya Zhang
Electronic Theses and Dissertations
The weather condition is a crucial influence factor on road safety issues. Fog is one of the most noticeable weather conditions, which has a significant impact on traffic safety. Such condition reduces the road's visibility and consequently can affect drivers' vision, perception, and judgments. The statistical data shows that many crashes are directly or indirectly caused by the low-visibility weather condition. Hence, it is necessary for road traffic engineers to study the relationship of road traffic accidents and their influence factors. Among these factors, the traffic volume and the speed limits in poor visibility areas are the primary reasons that …
An Analysis Of The Protected-Permitted Left Turn At Intersections With A Varying Number Of Opposing Through Lanes, Alexander Navarro
An Analysis Of The Protected-Permitted Left Turn At Intersections With A Varying Number Of Opposing Through Lanes, Alexander Navarro
Electronic Theses and Dissertations
The Flashing Yellow Arrow Left Turn signal is quickly becoming prominent in Central Florida as a new method of handling left turns at traffic signals. While the concept of a protected-permitted left turn is not groundbreaking, the departure from the typical display of a five-section signal head is, for this type of operation. The signal head introduced is a four-section head with a flashing yellow arrow between the yellow and green arrows. With this signal head quickly becoming the standard, there is a need to re-evaluate the operational characteristics of the left turning vehicle and advance the knowledge of the …
Safety Effectiveness Of Conversion Of Two-Way-Left-Turn Lanes Into Raised Medians, Saif Alarifi
Safety Effectiveness Of Conversion Of Two-Way-Left-Turn Lanes Into Raised Medians, Saif Alarifi
Electronic Theses and Dissertations
Two way left turn lanes (TWLTL) and raised medians are common median treatments on roadways. This research focused on evaluating the safety effectiveness of conversion of TWLTLs into raised medians using Before-After and Cross Sectional Studies. In the Before-After Studies, we evaluated the effect of this treatment using the Naive, Before-After with Comparison Group (CG), and Before-After with Empirical Bayes (EB) Methods. In order to apply these methods, a total of 33 segments of a treated group and 109 segments of a comparison group have been collected. Also, safety performance functions (SPFs) have been developed using the negative binomial model …
Applications Of Transit Signal Priority Technology For Transit Service, Frank Anthony Consoli
Applications Of Transit Signal Priority Technology For Transit Service, Frank Anthony Consoli
Electronic Theses and Dissertations
This research demonstrated the effectiveness of Transit Signal Priority (TSP) in improving bus corridor travel time in a simulated environment using real world data. TSP is a technology that provides preferential treatment to buses at signalized intersections. By considering different scenarios of activating bus signal priority when a bus is 3 or 5 minutes behind schedule, it was demonstrated that bus travel times improved significantly while there is little effect on delays for crossing street traffic. The case of providing signal priority for buses unconditionally resulted in significant crossing street delays for some signalized intersections with only minor improvement to …
Analysis Of Taxi Drivers' Driving Behavior Based On A Driving Simulator Experiment, Jiawei Wu
Analysis Of Taxi Drivers' Driving Behavior Based On A Driving Simulator Experiment, Jiawei Wu
Electronic Theses and Dissertations
Due to comfort, convenience, and flexibility, taxis become more and more prevalent in China, especially in large cities. According to a survey reported by Beijing Traffic Development Research Center, there were 696 million taxi person-rides in Beijing in 2011. However, many violations and road crashes that were related to taxi drivers occurred more frequently. The survey showed that there were a total of 17,242 taxi violations happened in Beijing in only one month in 2003, which accounted for 56% of all drivers' violations. Besides, taxi drivers also had a larger accident rate than other drivers, which showed that nearly 20% …
A Comparative Analysis Of Different Dilemma Zone Countermeasures At Signalized Intersections Based On Cellular Automaton Model, Yina Wu
Electronic Theses and Dissertations
In the United States, intersections are among the most frequent locations for crashes. One of the major problems at signalized intersection is the dilemma zone, which is caused by false driver behavior during the yellow interval. This research evaluated driver behavior during the yellow interval at signalized intersections and compared different dilemma zone countermeasures. The study was conducted through four stages. First, the driver behavior during the yellow interval were collected and analyzed. Eight variables, which are related to risky situations, are considered. The impact factors of drivers' stop/go decisions and the presence of the red-light running (RLR) violations were …
Urban Expressway Safety And Efficiency Evaluation And Improvement Using Big Data, Qi Shi
Urban Expressway Safety And Efficiency Evaluation And Improvement Using Big Data, Qi Shi
Electronic Theses and Dissertations
In an age of data explosion, almost every aspect of social activities is impacted by the abundance of information. The information, characterized by alarming volume, velocity and variety, is often referred to as "Big Data". As one fundamental elements of human life, transportation also confronts the promises and challenges brought about by the Big Data era. Big Data in the transportation arena, enabled by the rapid popularization of Intelligent Transportation Systems (ITS) in the past few decades, are often collected continuously from different sources over vast geographical scale. Huge in size and rich in information, the seemingly disorganized data could …
Evaluating The Effectiveness Of Conversion Of Traditional Five Section Head Signal To Flashing Yellow Arrow (Fya) Signal, Meshal Almoshaogeh
Evaluating The Effectiveness Of Conversion Of Traditional Five Section Head Signal To Flashing Yellow Arrow (Fya) Signal, Meshal Almoshaogeh
Electronic Theses and Dissertations
In the United States, there are two schemes of operating traffic signal controls for permitted protected left turns (PPLT) namely the traditional five-section head system (known as Dog-House) and the flashing yellow arrow system (FYA). Past studies have agreed that these controls lead to decrease the average delay per left turn vehicle, decrease the protected green time, increase the left turn capacity, and enhance the intersection overall operation. The flashing yellow arrow (FYA) has been approved by the Federal Highway Administration as the national standard for the PPLT operations at signalized intersections. So, the Florida Department of Transportation also approved …
Commuting In Portland, Oregon: The Advantages Of Living Within A Transit Oriented Development Community Compared To Traditional Suburban Development By Comparing Environmental, Economic And Health Factors, Kyle Simpson
HIM 1990-2015
Transportation is a function that affects nearly all life decisions, but is often not given much thought by the average individual throughout their daily routines. Most of this complacency streams from the mainstream development patterns in the United States that have changed little from the end of World War II. During the immediate post-war years a perfect mix for suburban living came together: the mass production of automobiles, guaranteed mortgages from the federal government through the G.I. Bill, and in 1956 the passage of the National Interstate and Defense Highways Act. These factors, along with the dominate social paradigm that …
Sustainable Transportation At The University Of Central Florida: Evaluation Of Ucf Rideshare Program, Zimride, Joseph Patrick Defrancisco
Sustainable Transportation At The University Of Central Florida: Evaluation Of Ucf Rideshare Program, Zimride, Joseph Patrick Defrancisco
Electronic Theses and Dissertations
As the second-largest university in the United States, UCF has experienced the largest enrollment in its history. A more densely populated campus has in turn caused increased traffic congestion. Despite increased parking permit fees and newly constructed parking garages, traveling and parking on campus is unpredictable. In effort to reduce congestion on campus, a rideshare program was implemented in Summer 2010. Several universities across the nation have successfully used carpooling as a viable alternative mode to manage traffic and parking demand. This thesis evaluates the UCF rideshare program, Zimride, using stated- and revealed-preference surveys. Preliminary results indicate most students prefer …
A Comprehensive Severity Analysis Of Large Vehicle Crashes, Haluk Laman
A Comprehensive Severity Analysis Of Large Vehicle Crashes, Haluk Laman
Electronic Theses and Dissertations
The goal of this thesis is to determine the contributing factors affecting severe traffic crashes (severe: incapacitating and fatal - non-severe: no injury, possible injury, and non-incapacitating), and in particular those factors influencing crashes involving large vehicles (heavy trucks, truck tractors, RVs, and buses). Florida Department of Highway Safety and Motor Vehicles (DHSMV) crash reports of 2008 have been used. The data included 352 fatalities and 9,838 injuries due to large vehicle crashes. Using the crashes involving large vehicles, a model comparison between binary logit model and a Chi-squared Automatic Interaction Detection (CHAID) decision tree model is provided. There were …
Evaluation And Modeling Of The Safety Of Open Road Tolling System, Muamer Ali Abuzwidah
Evaluation And Modeling Of The Safety Of Open Road Tolling System, Muamer Ali Abuzwidah
Electronic Theses and Dissertations
The goal of this thesis is to examine the traffic safety impact of upgrading Toll Plazas (TP) to Open Road Tolling (ORT). The ORT could enhance safety but could also pose some traffic safety concerns at Toll plazas. Crashes from eight years were investigated by evaluating the crash data before and after the implementation of the ORT. The study was conducted by using two approaches: 1) a simple before and after study and with a comparison group; 2) a modeling effort to help understand the relationship between the crash frequency and several important factors and circumstances such as injury severity, …
A Computer Graphics Analysis Of A Freeway Merge Control System, Thomas Alan Risher
A Computer Graphics Analysis Of A Freeway Merge Control System, Thomas Alan Risher
Retrospective Theses and Dissertations
In 1975, C.S. Bauer completed a doctoral dissertation at the University of Florida which treated the Green Band Merging Control System on I-75 in Tampa, Florida. In this work, Bauer suggested the possibility for the use of computer graphics as a toll for analysis of the bands generated by the Green Band Control System Simulation developed in his dissertation. The use of computer generated movies of the bands displayed to ramp drivers by the system allows the comparison of various band control strategies without the need for field implementation and testing. With the goal of producing such films in mind, …