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.
Results
Showing 1 to 20 of 20 for “"vehicle delay"”.
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Machine-learning-based vehicle delay prediction at signalized intersections
Delay is one of the critical elements of signalized intersections performance measures. Field delay calculations are usually time-consuming and inefficient and dominantly rely on manual observations and post-calculations or complicated infrastructure configurations of detectors and vehicular …
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Simulation of pedestrian effects on vehicle delay at signalized street intersections
… determine the effects of pedestrian movement on vehicle flow at signalized intersections. Specifically, a computer simulation model written in General Purpose Simulation System language was developed to calculate vehicle seconds of delay at two-lane by four-lane street intersections with …
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Isolated Traffic Signal Optimization Considering Delay, Energy, and Environmental Impacts
… lengths are traditionally optimized to minimize vehicle delay at intersections using the Webster formulation. This thesis includes two studies that develop new formulations to compute the optimum cycle length of isolated intersections, considering measures of effectiveness such as vehicle delay, …
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Integrated real-time disruption recovery strategies : a model for rail transit systems
… information technologies such as automatic vehicle location systems. This thesis focuses upon the development of a real-time disruption control model for rail transit systems during disruptions. A deterministic model to representing the rail transit system is first introduced. In the model, …
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Life cycle approach to bridge design
… equations for the construction, maintenance, and vehicle delay costs, a procedure for making decisions at the preliminary design stage is presented. Decisions are made on the basis of minimum present equivalent total cost and include the number of lanes to be provided, the span between piers, and …
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Do Roundabouts Work? An Evaluation for Uniform Approach Demands
… on all approaches. The study demonstrates that vehicle delay is minimized with the use of a roundabout intersection control for all demand levels below 500 veh/hr/approach. Above this point if the left turn percentage exceeds 70% traffic signal control is more efficient. The roundabout …
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Cooperative Decentralized Intersection Collision Avoidance Using Extended Kalman Filtering
… avoidance (CCA) system that optimizes each vehicle's controls subject to the constraint that no collisions occur. Three major contributions to the field of collision avoidance have resulted from this research. First, a nonlinear 5-state variable vehicle model is expanded from an earlier …
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Pedestrian effect on at-grade intersection vehicular flow
… that are significant to the pedestrian effect on vehicle flow at at-grade intersections. The data on these variables were collected and analyzed to determine if a statistical relationship existed between these selected variables and the vehicle seconds of delay being caused by pedestrian-vehicle …
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Field and Modeling Framework for Evaluating Truck Weigh Station Operations
… a procedure for relating axle accuracy to gross vehicle accuracy and develops a field and modeling framework for evaluating weigh station operations. The WIM scale operation at the Stephens City weigh station in Virginia is examined to demonstrate how the field and modeling framework can be …
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A Macroscopic Model for Evaluating the Impact of Emergency Vehicle Signla Preemption on Traffic
In the past, the study of Emergency Vehicle (EV) signal preemption has been mostly done using field studies. None of the simulation models that are currently commercially available have the capability to model the presence of EVs and simulate the traffic dynamics of the vehicles surrounding them. …
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Network-wide Assessment of Eco-Cooperative Adaptive Cruise Control Systems on Freeway and Arterial Facilities
… Control (Eco-CACC) systems attempt to minimize vehicle fuel consumption and emission levels by controlling vehicle speed and acceleration levels. The majority of previous research efforts developed and applied Eco-CACC systems on either freeway or signalized intersections independently on simple …
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Effect of pavement surface properties on life cycle cost analysis
… part of user costs. The work zone costs include vehicle delay costs, vehicle operating costs, crash costs, and emission costs. On the other hand, costs associated with normal operating conditions, such as vehicle operating costs, are independent of project alternatives and thus they are …
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Connected and Automated Vehicle Enabled Traffic Intersection Control with Reinforcement Learning
Recent advancements in vehicle automation have led to a proliferation of studies in traffic control strategies for the next generation of land vehicles. Current traffic signal based intersection control methods have significant limitations on dealing with rapidly evolving mobility, connectivity and …
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Transit Priority Measures at Unsignalized Intersections
Bus delays at unsignalized intersections (UIs) present a unique and persistent operational challenge, particularly for bus routes crossing from the minor approaches of these intersections. In addition, existing transit priority strategies were heavily focused on arterial corridors, leaving the UI …
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Dynamic Connected Automated Vehicle Trajectory and Traffic Signal Timing Optimization
… traffic signalized networks by optimizing both vehicle and traffic signal operations. From the vehicle side, the research develops a Green Light Optimal Speed Advisory (GLOSA) system also known as an Eco-Cooperative Adaptive Cruise Control system at intersections (ECO-CACC-I) for fixed and …
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Signal timing optimization based on minimizing vehicle and pedestrian delay by genetic algorithm
… intersection signal timing by minimizing total delay for both vehicles and pedestrians. The second objective is to establish guidance for pedestrian crossing phase selection (two-way or scramble) and the length of WALK phase when scramble crossing is used. An optimization procedure for signal …
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Eco-Driving in the Vicinity of Roadway Intersections - Algorithmic Development, Modeling and Testing
Vehicle stops and speed variations account for a large percentage of vehicle fuel losses especially at signalized intersections. Recently, researchers have attempted to develop tools that reduce these losses by capitalizing on traffic signal information received via vehicle connectivity with …
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Modeling Transit Vehicle Travel Time Components for Use in Transit Applications
… technologies including Connected Automated Vehicles (CAVs), loop detectors, Advanced Traveler Information Systems (ATISs), and Advanced Public Transportation Systems (APTSs) are being deployed. One of the successful techniques that has demonstrated benefits for system users, operators and …
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Delay, Stop and Queue Estimation for Uniform and Random Traffic Arrivals at Fixed-Time Signalized Intersections
… provide simple approaches for estimating delay, queue length and stops at signalized intersections, they are limited in scope. Alternatively, several microscopic simulation softwares are currently available for the evaluation of signalized intersections. The objective of this dissertation …
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Evaluation of Exposures to Diesel Particulate Matter Utilizing Ambient Air Monitoring and Urinary Biomarkers Among Pedestrian Commuters who Cross the U.S.-Mexico Border at San Ysidro, CA.
… 22% of the variance. Relative humidity and vehicle delay were both predictors of UFP measured at the border, explaining 13% and 21% of the variance, respectively. However, when modeled together none remain significant. There were no predictors for 1-NP measurements at the border. …