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 32 for “"left turn"”.
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Multi-Criteria Decision Based Left-turn Signal Control Guideline
There are primarily three types of left-turn controls at signalized intersections, namely permitted, protected, and protected-permitted. Selecting a left-turn signal control type is one of the major elements in traffic signal design and operations, and should be a systematic approach involving …
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Modeling Permissive Left-Turn Gap Acceptance Behavior at Signalized Intersections
… driver gap acceptance behavior for permissive left turn movements at signalized intersections. The thesis attempts to model the gap acceptance behavior using three different approaches, a deterministic statistical approach, a stochastic approach, and a psycho-physical approach. First, the …
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Safety Issues Of Red-light Running And Unprotected Left-turn At Signalized Intersections
Crashes categorized as running red light or left turning are most likely to occur at signalized intersections and resulted in substantial severe injuries and property damages. This dissertation mainly focused on these two types of vehicle crashes and the research methodology involved several …
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Development of Arrival/departure Based Uniform Delay Model for Left -Turn Traffic at Signalized Intersections
… intersections with protected-plus-permitted left turn phasing. Test results showed that the real-time signal control taking into account the left turn treatment and signal progression can improve the signal control effectiveness.
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Using Augmented Reality For Studying Left Turn Maneuver At Un-signalized Intersection And Horizontal Visibility Blockage
… used to conduct two traffic engineering studies; left-turn maneuver at un-signalized intersection, and horizontal visibility blockage when following a light truck vehicle. The results from this work supported the validity of our AR systems to be used as a surrogate to the field-testing for …
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Evaluation of Crossover Displaced Left-turn (XDL) Intersections and Real-time Signal Control Strategies with Artificial Intelligence Techniques
Although concepts of the XDL intersection or CFI (Continuous Flow Intersection) have been around for approximately four decades, users do not yet have a simplified procedure to evaluate its traffic performance and compare it with a conventional intersection. Several studies have shown qualitative …
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Effectiveness of Intersection Advanced Driver Assistance Systems in Preventing Crashes and Injuries in Left Turn Across Path / Opposite Direction Crashes in the United States
… This work reconstructed 501 vehicle-to-vehicle left turn across path / opposite direction (LTAP/OD) crashes in the United States which had been originally investigated in NMVCCS. The performance of thirty different I-ADAS system variations was evaluated for each crash. These variations were the …
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Empirical verification of modeled queue lengths
The purpose of left turn lanes is to separate left-turning vehicles from the through-traffic stream. This tends to increase capacity by adding another lane to the approaches of an intersection and also improves safety and reduces delay. Capacity, delay and operational issues are usually related to …
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Modeling Crash Frequencies At Signalized Intersections In Central Flor
… by the number of through lanes, number of left turning lanes, Average Annual Daily Traffic and Posted Speed limits on the Major road of the intersection. In this research, crashes and their type, e.g., rear-end, left-turn and angle as well as total crashes were investigated. Numerous models …
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Safety Analyses At Signalized Intersections Considering Spatial, Temporal And Site Correlation
… for total, rear-end, right-angle and left-turn crashes. Using the basic regression model for correlated crash data leads to invalid statistical inference, due to incorrect test statistics and standard errors based on the misspecified variance. In this dissertation, the Generalized …
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Multivariate Analysis of Accident Related Outcomes with Respect to Contemporaneous Correlation and Endogeneity: Application of Simultaneous Estimation Techniques
… endogenous relationship between the presence of left-turn lanes and angle crashes.Modeling crash types may provide certain advantages to gain insights as to 1) identification of high-risk sites with respect to specific types of crashes, which is not revealed through crash totals, and 2) the …
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Driver Safety and Emissions at Different PPLT Indications
… to NCHRP Report 493, there are five major left turn signal indications for permitted operations in the United States. They are: Circular Green (CG), Flashing Circular Red (FCR), Flashing Red Arrow (FRA), Flashing Circular Yellow (FCY) and Flashing Yellow Arrow (FYA). The main goal of this …
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Do Roundabouts Work? An Evaluation for Uniform Approach Demands
… 500 veh/hr/approach. Above this point if the left turn percentage exceeds 70% traffic signal control is more efficient. The roundabout alternative also produces the fewest vehicle stops for low demand levels, low left turn demand and high right turn demand, however a TWSC alternative produces …
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Traffic Safety Meta-Analysis of Reversible Lanes
… found to be a significant variable. Presence of left-turn restrictions was negatively correlated and significant, suggesting that application of a left-turn restriction can improve the safety of reversible lanes. The presence of delineator/barrier was generally negatively correlated, and both the …
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Evaluation of Driver Performance While Making Unprotected Intersection Turns Utilizing Naturalistic Data Integration Methods
… databases to obtain instances of unprotected turns at the same intersection. Several dependent variables were analyzed which included visual entropy, mean-duration of glances to locations in the driver's view, gap-acceptance/rejection time. Kinematic dependent variables include peak/average …
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Safety Effects Of Traffic Signal Installations On State Road Intersections In Northeast Florida
… crash rate dropped by 66%, both are significant. Left-turn crashes dropped by 8% and their rate by 16%, although neither was significant. Rear-end crashes increased by 86% and the rear-end crash rate decreased by 5%. Neither of these changes was statistically significant. When crash severity was …
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Modeling Driver Behavior and I-ADAS in Intersection Traversals
… trajectories: straight crossing path (SCP); left turn across path opposite direction (LTAP/OD); and left turn across path lateral direction (LTAP/LD). About 140,000 intersection traversals were characterized and used to train a unique driver behavior model. The median average speed for all …
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Intelligent dynamic signal timing optimization program
… undersaturated conditions. Using IDSTOP, Optimal Left Turn Management Program (OLTMP) was developed. OLTMP improves network performance by prohibiting the left turns at certain intersections of the network. Numerical findings indicated that OLTMP had great potential to improve network performance …
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Range and endurance modelling of a multi-engine aircraft with one engine inoperative (oei)
… including range and endurance performance, and turning flight performance. The modelling was mainly based on methods available in Jan Roskam textbooks and USAF DATCOM. The model used Thrust and Specific Fuel Consumption data presented in Jenkinson, L.R., Simpkin, P., and Rhodes, D., "Civil Jet …
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A Prioritization Process for Access Management Implementation in Utah
… signals per mile, access density, and two-way left-turn lanes were all positively correlated with crashes. Other characteristics such as adjacent land use and volume were also analyzed. Finally, recommendations for access management treatments were given in the form of a decision tree. The …
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