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 14 of 14 for “"Loop Detector"”.
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Bicycle detection through the use of inductance loop detectors at vehicular actuated traffic signals
… detect vehicle presence and/or passage. Proper detector operation is, however, frequently precluded because of the small mass and size of bicycles. The most popular type of in-road sensing device in use today is the inductance loop detector. As the bicycle continues to increase in importance as …
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A Study of Inclement Weather Impacts on Freeway Free-Flow Speed
… thesis attempts to investigate the impact of detector failure frequency 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 …
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Establishment & Assessment of the Macroscopic Fundamental Diagrams for the City of Durban Freeway Network Using Empirical Data
… i,e. the National route 2 and 3. The study used loop detector data extracted from a total of 88 loop detector stations. The loop detector stations were dispersed 100-500 m apart over the network. The data was recorded in September 2019. The collected data was analysed in five minutes intervals. …
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Incident-Related Travel Time Estimation Using a Cellular Automata Model
… Virginia. The data for this study included loop detector data and incident data for the road segment for the year 2007. Flow and speed data from the detectors were used for calibration using quantitative and qualitative techniques. The cellular automata model properly reproduced the traffic …
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Evaluating Ramp Metering And Variable Speed Limits To Reduce Crash Potential On Congested Freeways Using Micro-simulation
… metropolitan region. The section consists of 17 Loop Detector stations, 11 On-ramps and 10 off-ramps. PARAMICS micro-simulation is used as the tool for modeling the freeway section. The simulated network is calibrated and validated for 5 minute average flows and speeds using loop detector data. …
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Dynamic OD Estimation with Bluetooth Data Using Kalman Filter
… our study, we use Bluetooth data to supplement loop detector data while estimating dynamic OD matrices using Kalman filter. We use OD proportions as state variables and travel times, link counts, Bluetooth OD matrix and input and exit volumes as measurements. A simulation experiment is conducted …
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Off-line Multi-Sensor Multi-Source Calibration of Dynamic Traffic Assignment: Simultaneous Demand-Supply Estimation based on Genetic Algorithms in a High-Performance Computer
… from multiple sources, ranging from traditional loop detector data to traffic data from recent emerging technologies, and allocates relative weights to different terms of the objective function. A genetic algorithm (GA) is selected as a suitable solution algorithm for the resulting nonlinear …
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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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Distributed mobile platforms and applications for intelligent transportation systems
… large-scale scenarios using actual traffic loop-detector counts from Singapore.
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Dynamic Connected Automated Vehicle Trajectory and Traffic Signal Timing Optimization
… real-time back-of-the-queue estimation using loop detector and probe vehicle data with trajectory optimization, considering uncertainties in actuated traffic signal timings. The system enhances queue length estimates without relying on historical data and significantly improves upon the sole …
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Understanding Traffic Congestion Through Multiscale Analysis: Sensor Deployment, Car-Following and Universal Scaling
… flow and density across urban networks. While loop detector data is the most commonly used source for estimating the MFD, its accuracy can be affected by how detectors are positioned along the network. Analytical derivations, empirical analyses, and simulation experiments show that the spatial …
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A merging model for motorway traffic
… readily available traffic surveillance data, the loop detector data. Currently no commonly agreed bench-marking procedure exists (Brockfeld et al., 2005), and this framework has the advantage that the concept and the proposed methodology are suitable for general application to other …
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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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Calibration and Comparison of the VISSIM and INTEGRATION Microscopic Traffic Simulation Models
… various car-following models using macroscopic loop detector data. The calibration procedures are developed for a number of commercially available microscopic traffic simulation software, including: CORSIM, AIMSUN2, VISSIM, Paramics, and INTEGRATION. The procedures are then applied to a sample …