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 17 of 17 for “"Loop Detectors"”.
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Bicycle detection through the use of inductance loop detectors at vehicular actuated traffic signals
… sensing device in use today is the inductance loop detector. As the bicycle continues to increase in importance as a transport mode for a growing number of people, the detection of bicycles through the use of inductance loop detectors at vehicular actuated traffic signals also continues to …
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Evaluation of detection technologies for use in traffic management and control
… as possible replacements for inductive loop detectors because of the difficulties associated with installing detectors in the roadway. During the project, systems engineering principles were used to define the requirements, select the alternative technologies, and evaluate the candidates …
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Freeway Travel Time Estimation Based on Spot Speed Measurements
… being applied in this project, intrusive loop detector, as the representative of spot measurement devices, is the most common. The ultimate goal of this dissertation is to seek a TTE approach based primarily on spot speed measurement and capable of successfully performing in a certain …
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Investigating the Properties and Existence of a Macroscopic Fundamental Diagram for Arterial and Freeway Traffic Systems
… of the errors is provided. Using real data from detectors for an urban arterial and a freeway network we validate the proposed derivations and we show that an MFD is not well defined in freeway networks as hysteresis effects are present. The hysteresis phenomenon in network is investigated at …
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A System for Travel Time Estimation on Urban Freeways
… widely deployed in urban areas. Hence, data from loop detectors or other point estimators of traffic flow variables are predominantly used for travel time estimation. Most point detectors can provide this data efficiently. Some attempts have been made in the past to estimate travel times from …
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An analysis of the impact of wireless technology on public vs. private traffic data collection, dissemination and use
… task, public agencies have employed inductive loop detectors, closed circuit television cameras, technology for tracking electronic toll tags, and other surveillance devices, in an effort to monitor conditions on roads within their jurisdictions. The high cost of deploying and maintaining this …
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Congestion-aware traffic routing for large-scale mobile agent systems
… data collected from roving taxis and inductive loop detectors. Our system uses a data-driven traffic model that captures important traffic patterns and conditions using the two sources of data. We evaluate the system using a rich set of GPS traces from 16,000 taxis in Singapore and show that the …
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Development and evaluation of traffic prediction systems
… time interval measured by regular induction loop detectors. The prediction models are shown to be capable of producing reliable and accurate forecasts under congested traffic condition. The prediction systems perform better in the 15-minute range than in the ranges of 30-minute or 45-minute. …
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Crowdsourcing traffic data for travel time estimation
… using a wide variety of sources like inductive loop detectors, video cameras, radio frequency identification (RFID) transponders etc. But these systems include deployment of infrastructure which has some limitations and drawbacks. The main drawbacks in these modes are the high cost and the high …
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FRIEND: A Cyber-Physical System for Traffic Flow Related Information Aggregation and Dissemination
… optical fiber under the median. Unlike inductive loop detectors, adjacent RSUs along the roadway are not connected with each other, thus avoiding the huge cost of optical fiber. Each RSU contains a GPS device (for time synchronization), an active Radio Frequency Identification (RFID) tag for …
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A Study of Inclement Weather Impacts on Freeway Free-Flow Speed
… and failure duration on the accuracy of loop detector speed, flow, and density measurements using a Monte Carlo simulation approach. The inputs to the model are the frequency of failures and failure duration. Several regression models were developed to relate loop detector accuracy to …
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Physical Layer Data Integrity Attacks and Defenses in Cyber-Physical Systems
… is proposed. This approach utilizes inductive loop detectors (ILD) to capture unique electromagnetic signatures of vehicles, achieving up to 93% accuracy in identifying their make, model, and year. The ILD-based technique secures access control in automated systems and provides a …
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Estimation Of Hybrid Models For Real-time Crash Risk Assessment On Freeways
… store, and analyze traffic data from underground loop detectors has witnessed enormous growth in the recent past. These two facts together provide us with motivation as well as the means to shift the focus of freeway traffic management toward proactive strategies that would involve anticipating …
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A Comparison of CORSIM and INTEGRATION for the Modeling of Stationary Bottlenecks
… measurements that can be easily obtained from loop detectors. The calibration procedure, while it does not overcome the inherent shortcomings of the Pipes model, does provide an opportunity to better calibrate the network FRESIM car-following sensitivity factor to existing roadway conditions. …
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Modeling Transit Vehicle Travel Time Components for Use in Transit Applications
… 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 agencies is Transit …
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Empirical Estimation of a Macroscopic Fundamental Diagram (MFD) for the City of Cape Town Freeway Network
… of flow and density from individual fixed loop detectors were aggregated the scatter nearly disappeared and points grouped neatly to form a clearly defined free-flow state, critical state and the formation of hysteresis loops past the critical density corresponding with the network observed …
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Data-driven modeling and transportation data analytics
… with data from stationary sensors such as loop detectors. To assimilate both stationary and mobile data to estimate highway traffic, a Gaussian process model is developed with a novel covariance function to integrate fundamental features of the congestion propagation within a Bayesian …