Development of Warrants for Left-turn Lanes at Unsignalized Intersections in Korea PDF Download
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Author: Kyung-Whan Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
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Book Description
Author: Kyung-Whan Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
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Book Description
Author:
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages :
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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: Yi Qi
Publisher:
ISBN:
Category : Right-turn lanes
Languages : en
Pages : 126
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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: Kenneth R. Agent
Publisher:
ISBN:
Category : Road markings
Languages : en
Pages : 44
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Author: M. D. Harmelink
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 72
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Author: Kenneth R. Agent
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 48
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Author: Tanweer Hasan
Publisher:
ISBN:
Category :
Languages : en
Pages : 398
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Author:
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 140
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Author: Patrick T. McCoy
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 33
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Author: Kenneth R. Agent
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
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Book Description
