Development of Warrants for Left-turn Lanes. Interim Report PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Development of Warrants for Left-turn Lanes. Interim Report PDF full book. Access full book title Development of Warrants for Left-turn Lanes. Interim Report by Kenneth R. Agent. Download full books in PDF and EPUB format.
Author: Kenneth R. Agent
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
Get Book Here
Book Description
Author: Kenneth R. Agent
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
Get Book Here
Book Description
Author: Kenneth R. Agent
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 48
Get Book Here
Book Description
Author: Kenneth R. Agent
Publisher:
ISBN:
Category : Road markings
Languages : en
Pages : 44
Get Book Here
Book Description
Author: Eugene F. Reilly
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 6
Get Book Here
Book Description
Author: Yi Qi
Publisher:
ISBN:
Category : Right-turn lanes
Languages : en
Pages : 126
Get Book Here
Book Description
Right-turn lanes provide space for the deceleration and storage of right-turn vehicles, and separate turning vehicles from through movements. Dual right-turn lanes are increasingly used at urban intersections primarily for two reasons: (1) to accommodate high right-turn demands and avoid turn-pocket overflows, and/or (2) to prevent right-turn vehicles that exit from a nearby upstream freeway off-ramp (on the left of the roadway) from abruptly changing too many lanes toward the right-turn lane at the intersection. In addition, a number of other factors may affect the decisions on the installation of dual right-turn lanes. However, warrants for dual right lane installation are almost non-existent, leaving traffic engineers to rely on engineering judgment. This research aims to develop warrants for installation of dual right-turn lanes at signalized intersections. Both the operational and safety benefits/costs were analyzed by surveying traffic engineers and by conducting traffic simulation-based analysis. Microscopic traffic simulation model, VISSIM, was used to quantify the operation benefits and Surrogate Safety Assessment Model (SSAM) developed by Siemens was used to analyze the safety gains due to installation of dual right-turn lanes.
Author: University of Illinois at Urbana-Champaign. Department of Civil Engineering
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 216
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages :
Get Book Here
Book Description
Left-turn movements at intersections, including driveways - especially movements that are made from lanes that are shared with through traffic - cause delays and adversely impact safety. Although left-turn warrants have been updated, many agencies still use research performed by M. Harmelink from the mid-1960s. While most states use procedures that are based on Harmelink, a number of limitations of Harmelink's procedure have been identified. Economic analysis can provide a useful method for combining traffic operations and safety benefits of left-turn lanes to identify situations in which left-turn lanes are and are not justified economically. This project used a benefit-cost approach to determine when a left-turn lane would be justified. The steps included simulation to determine delay savings from installing a left-turn lane, crash costs and crash reduction savings determined from safety performance functions and accident modification factors available in the "Highway Safety Manual," and construction costs. Left-turn lane warrants were developed for rural two-lane highways, rural four-lane highways, and urban and suburban roadways. In addition, warrants for bypass lanes were developed for rural two-lane highways. A "Design Guide on Left-Turn Accommodations at Unsignalized Intersections" was developed that discusses left-turn lane designs, traffic control treatments, and case study examples.
Author: International Road Federation
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 230
Get Book Here
Book Description
Author: Kyung-Whan Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
Get Book Here
Book Description
Author: Amiy Varma
Publisher:
ISBN:
Category : Right-turn lanes
Languages : en
Pages : 194
Get Book Here
Book Description
The goal of this project was to analyze geometric, speed, volume, and crash data for a broad range of conditions with the ultimate objective of establishing bases for warrants for right-turn lanes on two-lane roads where major approach did not have any controls. Right-turn lane guidelines for this contest is not clear and convincing. Safety effectiveness and savings were estimated using extensive data examination and analysis of crash data, several statistical models that were developed using crash data, and a conflict model, which was developed using field data. It was found that not all accidents are eliminated with use of right-turn lane. However, right-turn lanes were effective in improving safety. More interesting was the finding that safety effectiveness of right-turn lanes was more at driveways than at intersections. Operational effectiveness was estimated using a delay model and a fuel consumption model, which were developed using field data, simulation software (CORSIM®), and statistical software, Minitab®. The volume thresholds that varied with changes in right-turn lane cost and fuel cost were provided as alternative scenarios for warrants. The warrants established here will be helpful in decision-making regarding whether to implement a right-turn lane or not on two-lane roads.
