Author: Kerrie L. SchattlerPublisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 73
Book Description
State-of-the-art Literature Review on Permissive/protected Left-turn Control
Author: Kerrie L. SchattlerPublisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 73
Book Description
Evaluation of Traffic Signal Displays for Protected/permissive Left-turn Control
Author: Christopher Lynn BrehmerPublisher: Transportation Research Board
ISBN: 0309087570
Category : Information display systems
Languages : en
Pages : 94
Book Description
Preparing to Resume a Permissive Left-turn Task
Author: Lingqiao Qin (Ph.D.)Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
With the increase in the development efforts of vehicular automation, driving automation systems are expected to assist and replace human drivers to reduce traffic crashes due to human errors. Most driving automation systems to date make the task of driving a vehicle one that is shared between the system and the driver. This research aims to contribute by advancing the understanding of driver behavior in automated driving systems to develop more feasible and reliable driving automation systems when encountering permissive left-turn maneuvers. Specifically, this research examines the control transitions from automation systems to human drivers when approaching a signalized intersection and desired left-turn maneuver with permissive left turn operations in urban environments. Permissive left turns are selected because of the inherent complexities in gap selection and traffic signal phasing determination required to safely complete this maneuver.Throughout the proposed research, two key issues associated with control transitions will be conquered, which are: (1) How drivers will resume control from the automation system and complete the left-turn task at permissive left-turn signal indications; and (2) How control transitions affect traffic operations and safety of a signalized intersection. To thoroughly explore these two problems, the proposed research first examines the state-of-the-art of the levels of driving automation systems and their deficiencies. Recognizing that human drivers still need to intervene the control process and to resolve certain critical situations that currently are out of automation's limits, this research focuses on the human driver's role in a SAE Level 3 driving automation system. When the AI-powered driving automation system encounters a permissive left-turn operation at a signalized intersection, it needs to traverse the intersection efficiently and safely, or at least as well as a human driver does. Building upon the knowledge gained regarding the behavior of driving automation systems at signalized intersections, this study further examined how the vehicle control will be switched from the automation system to the human drivers. There is a need to understand the timing and the sequence of driver behavior during the takeover and the left-turn maneuvers. Therefore, the delivery of takeover requests (TORs), drivers' situational awareness, supervision over driving automation system, and takeover performances will be closely studied. Driving automation is expected to relieve drivers from the tedium of driving, opening new ways for drivers to spend their time on things of their own interest. Accordingly, non-driving related tasks (NDRTs) that could keep drivers physically and mentally occupied from driving tasks will be utilized in this research. However, making a left turn at a permissive left-turn signal indication is complex for human drivers when traffic coming from opposing direction is heavy, gaps between vehicles are tight, or the available acceptable gaps are few. The incorporation of NDRTs is intended to simulate a more realistic future situation in which distracted human drivers must resume control before or as the driving automation fails to make a left turn. Through meta-regression analysis, this research investigates how drivers would perform permissive left-turn maneuvers with different TOR lead times while engaging in NDRTs. After investigating the effects that NDRTs and TORs have on takeover behavior in the circumstance of permissive left turns, this research then models drivers' takeover behavior in VISSIM. The impact that the occurrence of taking-over control has on traffic operations at an intersection remains unknown. Accordingly, the second component of the proposed research is to examine the impact of the control transitions from automation to driver when approaching a signalized intersection where the driving automation planned to make a left turn and permissive left turn operations is detected. Multiple simulation tasks are accomplished to fill this knowledge gap. This research focuses the discussion of potential impact of takeover on traffic efficiencies on the circumstance of signalized intersections that allow for permissive left-turn maneuvers. To evaluate the throughput, delay, and queuing at an intersection where left-turning movements with mixed manual vehicles and automated driving systems are permitted, three different penetration rates of the driving automation systems will be adopted with optimized cycle lengths and signal timings. Based on the simulation results, this research identifies the impact of control transition from automation to drivers on traffic operations at a signalized intersection. The overarching goal is to identify how drivers would reclaim control from the system to complete a left-turn task and how this transition will affect the traffic speed, queue length, delay, and safety at signalized intersections. This research utilized results from existing control-transition studies and extended it to predict takeover behavior in new disengagement scenarios. The results of this research show that operating speed of vehicle before automation disengagement, lead time, driver age, and NDRTs are four main factors that affect drivers' takeover response. A XGBoost model is also developed that uses the identified influencing factors to predict drivers' takeover behavior. Through meta-regression analysis, Driver-automation system (DAS) modeling, and VISSIM simulation, it is shown that even though triggering events of disengagements could be very different, drivers' response to TORs is only determined by when to take over control and how much longitudinal and lateral control is needed. There is no previous research that has similarly combined the results of multiple studies and apply them to new scenarios. This research made a significant contribution by systematically assessing study-level results and then derive high-level summary measures of takeover behavior. Methodologically, this research has demonstrated a statistical procedure that combined data from multiple studies focusing on the same question-takeover behavior in control transitions to consolidate research evidence into a quantitative estimates of drivers' takeover behavior. How learned knowledge and quantitative estimates of takeover behavior can be incorporated in simulation is also shown in this research. A model framework capturing the interactions of a DAS during control transition in the context of PPLT scenario is also presented in this research. The core problem of a DAS in PPLT scenario is how a driver might take back control from an automation system. Automation disengagement and driver takeover behavior can be simulated by an event-based approach in VISSIM. The methods used in this research including meta-regression analysis, DAS modeling, and VISSIM simulation serve as a general framework enabling comprehensive data consolidation and knowledge enhancement and expansion. The unique model calibration method and simulation analysis in this study have potential to be used in practical engineering applications for safety evaluations of signalized intersections.
Safety and Operations Assessment of Various Left-turn Phasing Strategies
Author: Ali HajbabaiePublications of the State of Illinois
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 92
Book Description
Highway Research Abstracts
Author: Annual Report
Author: University of Minnesota. Intelligent Transportation Systems InstitutePublisher:
ISBN:
Category : Intelligent Vehicle Highway Systems
Languages : en
Pages : 64
Book Description
Summary of Progress - National Cooperative Highway Research Program
Author: National Cooperative Highway Research ProgramPublisher:
ISBN:
Category : Highway research
Languages : en
Pages : 276
Book Description
Directory
Author: Institute of Transportation EngineersPublisher:
ISBN:
Category :
Languages : en
Pages : 452
Book Description
Traffic Signal Timing Manual
Author: U.s. Department of TransportationPublisher: CreateSpace
ISBN: 9781508557173
Category : Transportation
Languages : en
Pages : 286
Book Description
This report serves as a comprehensive guide to traffic signal timing and documents the tasks completed in association with its development. The focus of this document is on traffic signal control principles, practices, and procedures. It describes the relationship between traffic signal timing and transportation policy and addresses maintenance and operations of traffic signals. It represents a synthesis of traffic signal timing concepts and their application and focuses on the use of detection, related timing parameters, and resulting effects to users at the intersection. It discusses advanced topics briefly to raise awareness related to their use and application. The purpose of the Signal Timing Manual is to provide direction and guidance to managers, supervisors, and practitioners based on sound practice to proactively and comprehensively improve signal timing. The outcome of properly training staff and proactively operating and maintaining traffic signals is signal timing that reduces congestion and fuel consumption ultimately improving our quality of life and the air we breathe. This manual provides an easy-to-use concise, practical and modular guide on signal timing. The elements of signal timing from policy and funding considerations to timing plan development, assessment, and maintenance are covered in the manual. The manual is the culmination of research into practices across North America and serves as a reference for a range of practitioners, from those involved in the day to day management, operation and maintenance of traffic signals to those that plan, design, operate and maintain these systems.