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 20 of 67 for “"Speed Limit"”.
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Optimal speed limit for shared-use roadways
… costs, it is necessary to determine optimal speed limits on roadways because of the strong relationship among posted speed limit, crash frequency, and crash injury severity. A comprehensive literature review about the relationship among posted speed limit, crash frequency, and crash injury …
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Increasing Speed Limit Compliance in Reduced-Speed School Zones
Reduced-speed school zones greatly improve the safety of young children commuting to and from school and provide larger gaps in traffic for children to cross the street. The main focus of this study was to determine effective methods for increasing speed compliance in reduced-speed school zones. …
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Efficacy of Speed Monitoring Displays in Increasing Speed Limit Compliance in Highway Work Zones
… highway work zones, including lowering the mean speed of vehicles in the work zone, encouraging drivers to be alert in work zones, improving the control of traffic in merging areas, and improving the safety devices that separate vehicles and construction workers. This study focuses on the goal of …
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Benefits of Advanced Traffic Management Solutions: Before and After Crash Analysis for Deployment of a Variable Advisory Speed Limit System
<p>Variable speed limit (VSL) systems are important active traffic management tools that are being deployed across the U.S. and indeed around the world for relieving congestion and improving safety. Oregon’s first variable advisory speed limit signs were activated along Oregon Highway 217 in the …
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Developing an alternative means of assessing speed limits on rural single carriageway roads in Ireland using observed driver behaviour.
Speed limits in Ireland have undergone many changes since first introduced, most notably in 2005 when the State adopted metric speed limits. The challenge presented to the Department of Transport, Tourism and Sport and Local Authorities is to assess, manage and implement a system of speed limits …
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Advanced Speed Control Strategies to Reduce Delay and Improve Safety of Car-Truck Mixed Traffic Flow
This study develops an advanced speed control strategy called “differential variable speed limit (DVSL)”. DVSL assigns different speed limits for car and 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 …
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Evaluation of the feasibility of posting reduced speed limits on Kansas gravel roads
… Most of the gravel roads are not posted with speed limit signs but regulated with a 55 mph blanket speed limit established by the Kansas Statutes. Surface conditions of gravel roads are very likely to change with time, space, and quality of maintenance work, making it even more necessary to …
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Development and Demonstration of a In-Vehicle Lane Departure and Advanced Curve Speed Warning System
… In case of LDWS, these systems have some limitations such as harsh weather or irregular lane markings can influence their performance. Other LDWS use GPS receiver with access to lane-level resolution digital maps to system's efficiency but make the overall system more complex and …
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The Effect of Directional Auditory Cues on Driver Performance in a Simulated Truck Cab Environment
… density and timing of the prompts in relation to speed limit changes. All experimental conditions were compared to a control condition containing no secondary task. Both driving performance (lane deviation, steering wheel angle, road heading angle error, accidents, and adherence to the speed …
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A Field Experiment to Test the Effects of Automated Feedback and Monetary Incentive on Speeding Behavior
… experiment tested the effects of two systems on speeding, mental workload, and driver acceptance of the systems. Using GPS technology integrated with GIS referenced speed limit information, eight vehicles were instrumented in a manner that allowed real time knowledge of vehicle speed relative to …
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An economic model of highway fatalities
… collected for the following variables: average speed, speed variance, percentage of drivers wearing seat belts, percentage of licensed male drivers, percentage of drivers under 25 years of age, drinking age for beer, per capita alcohol consumption, percentage of urban population, and percentage …
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A Study of the Effectiveness of Unmanned Radar as a Speed Control Technique in Freeway Work Zones
… these efforts are actively pursued. Excessive speed is often a contributing factor to work zone accidents. One method of speed control in work zones is the deployment of unmanned, or drone, radar transmitters, to simulate and supplement police presence in work zones. A review of the literature …
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Vehicle tracking and speed estimation for traffic surveillance
… of motorists, traffic law enforcement assign speed limits at different locations throughout the country. However, irresponsible motorists still exceed the speed limit since they know it is unlikely that they will get caught. In this paper, a system is developed which is capable of detecting …
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In-vehicle speed adaptation - On the effectiveness of a voluntary system
… is to study the long term effects of a voluntary speed adaptation system, the Active Accelerator Pedal (AAP), and its effectiveness for different driver types. The papers making up this thesis are based on a study carried out on 284 vehicles and drivers in the Swedish city of Lund from 1999 until …
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Self-Management for Safety: Impact of Self-Monitoring versus Objective Feedback
… of total driving time traveling below the posted speed limit compared to a Control group that did not receive any of the SMS components. Across the four trials, participants in the SM and SM + OFB group significantly increased the percentage of total driving time traveling below the posted speed …
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Optimal control and speed limits of two-qubit quantum gates
The speed of elementary quantum gates, especially two-qubit gates, sets a fundamental limit on how fast a quantum computer can run. For current quantum computers that are subject to noise and errors, the speed of quantum gates is even more important as qubits have finite coherence times, and faster …
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Large-scale high-density terahertz radiator and receiver Arrays on silicon chips
… communications. Historically, due to their speed limit, silicon-based transistors are unable to reach this frequency range, so terahertz systems were built upon high- cost custom-made devices, which limits their application space. Currently, thanks to Moore's law, the f[subscript max] of …
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Experimental Evaluation of Merged-View Systems and VR-Based Reconstruction Approaches for Enhanced Mining Vehicle Teleoperation
… including completion time, path adherence, and speed-limit violations, were recorded for comparison. Results showed that the merged-view system enabled 6 % faster completion times, 21 % higher path adherence, and 28 % fewer speed-limit violations. Eye-tracking metrics revealed more efficient and …
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Development of high-speed P-i-N photodetector for 50Gb/s optical link in data centers
… computing (HPC) have been pushing the speed limit of communication. The growing dependence on the optical interconnect in data centers results from its superiority over traditional electrical interconnects to transmit data at high speed over long distance. The P-i-N photodiode, having …
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