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 25 for “"Mixed traffic"”.
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Mixed traffic in Chinese cities : bicycle and the intersection problems
The mixed traffic (the traffic made up of bicycles and automobiles) is widely spread in Chinese cities. It is also greatly responsible for major traffic problems, such as the conflicts, low efficiency and safety problems. These problems are most evident at street intersections. However, they have …
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SAFE REINFORCEMENT LEARNING-BASED GREEN LIGHT OPTIMAL SPEED ADVISORY FOR MIXED-TRAFFIC PLATOONS
… system to optimize the CAV speed profile of a mixed-traffic platoon. First, we design a multi-agent RL algorithm to achieve a balance between the energy and travel efficiency of a mixed-traffic platoon, where the impact of the CAV speed policy on its following vehicles is considered. Second, to …
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External communication displays for connected truck platoons in mixed traffic : a federated simulator study
… communication between CAVs and the surrounding traffic. For example, research has shown that communication between CAV and pedestrians and cyclists is facilitated by using external status displays on the CAVs. In order to investigate the communication between truck platoons and surrounding …
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Microscopic Simulation Model for Mixed Traffic of Connected Automated Vehicles and Conventional Vehicles on Freeways
This study developed mixed-traffic simulation models of connected automated vehicles (CAVs) and manually-driven vehicles (MDVs) at the full-spectrum of mixed penetration rates on a freeway segment by incorporating the car-following and lane-changing models via a conditional linkage to investigate …
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Advanced Speed Control Strategies to Reduce Delay and Improve Safety of Car-Truck Mixed Traffic Flow
… truck, and it also varies speed limits based on traffic conditions. The study tested the impacts of DVSL on delay and safety for a section of the Gardiner Expressway in Toronto, Canada. In this study area, recurrent congestion occurs due to a sudden increase in entry traffic volume from an …
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Application of smart antennas to wideband code division multiple access : the uplink performance
… can deliver in a 3G environment (i.e., with mixed traffic), the implementation of adaptive antenna arrays for the uplink of a Wideband Code Division Multiple Access (WCDMA) system in the Frequency Division Duplex (FDD) mode is addressed in this thesis. The beam-forming is implemented with a …
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Heterogenous motorised traffic flow modelling using cellular automata
Traffic congestion is a major problem in most major cities around the world with few signs that this is diminishing, despite management efforts. In planning traffic management and control strategies at urban and inter urban level, understanding the factors involved in vehicular progression is …
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Learning to Trade Off Performance and Safety in Mixed Autonomy Traffic
… need to study the interactions between efficient traffic flow and driving safety in mixed autonomy traffic. Extending from reinforcement learning methods in robotic control methods and from learning methods for location-based actuators like traffic lights, this thesis considers control strategies …
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Bus rapid transit : impacts on travel behavior in Bogotá
… between the traditional buses operating in mixed traffic and the BRT. The main result is that traveling conditions have improved substantially which is reflected in the reduction of the burden associated with traveling. This is demonstrated by the lower value of time found for BRT in …
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Simulation and queueing network model formulation of mixed automated and non-automated traffic in urban settings
… vehicles offer numerous benefits to highway traffic, but their impact on traffic in urban scenarios with mixed autonomous and non-autonomous traffic is less understood. This research addresses this issue by using microscopic traffic simulation to develop understanding of how traffic dynamics …
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A Real-Time Server Based Approach for Safe and Timely Intersection Crossings
Safe and efficient traffic control remains a challenging task with the continued increase in the number of vehicles, especially in urban areas. This manuscript focuses on traffic control at intersections, since urban roads with closely spaced intersections are often prone to queue spillbacks, which …
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Behavioural adaption of drivers of unequipped vehicles to short time headways observed in a vehicle platoon
… driving situations. As a consequence, a mixed traffic situation is likely to emerge where vehicles equipped with different degrees of automated systems will interact with unequipped vehicle drivers (UVDs). Platoons of vehicles comprise a vision for future traffic and are designed to …
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Multiple access protocols for multichannel communication systems
… investigate channel capacity allocation among mixed traffic, i.e., multiple classes of users. We will consider a first-come first-serve (FCFS) access strategy, a non-preemptive priority scheme, a preemptive resume priority scheme, and several channel capacity allocation schemes. We develop …
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A methodology for identifying potential locations for bus priority treatments in the London Network
… preferential treatment to buses operating in mixed traffic. This thesis aims at developing a methodology for identifying locations for potential bus priority implementation, referred to as hot spots. While hot spots can occur at various spatial levels, the research focuses on identifying hot …
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Mitigating negative transport externalities in industrialized and industrializing countries
… efficient model to simulated heterogeneous traffic conditions. With the first objectives, the idea is to investigate the policy measures in the context of industrialized nations; this is addressed in the first part of the thesis. In a simulation environment, marginal social cost pricing …
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The development of rail-head acoustic roughness
… both for individual vehicle types and for mixed traffic. The model parameters match those at a site used for measurements of roughness development taken by Deutsche Bahn AG as part of the EU project Silence. The study shows that it is important to include non-Hertzian effects when studying …
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Transit Priority Measures at Unsignalized Intersections
… without imposing significant impacts on general traffic at these locations, there is growing interest in localized strategies that can be implemented without fully retrofitting the UI intersection area. The purpose of this study is to develop and evaluate a systematic framework for identifying …
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Improving TCP Data Transportation for Internet of Things
… true for IoT. Our results show that for TCP only traffic, buffer size calculated by the state of the art schemes results in at least 60% higher queuing delay compared to our scheme while achieving almost similar access link utilization, loss-rate, and goodput. For UDP only traffic, our scheme …
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String Stable Constant-Spacing Platoon with Robustness to Communication Delays and Cutoff
… delays and cutoffs, which are common in modern traffic networks. Therefore, this thesis develops a new constant-spacing control approach that is robust to communication delays and cutoff. Moreover, this thesis develops conditions for guaranteeing string stability for constant-spacing policy …
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