Assessment of the Benefits for Two-way Center Left-turn Lanes (CLTL). PDF Download

Author: Tapan K. Datta
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 264

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Author:
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 39

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"The Federal Highway Administration organized a Pooled Fund Study of 26 States to evaluate low-cost safety strategies as part of its strategic highway safety effort. One of the strategies chosen to be evaluated for this study was the installation of center two-way left-turn lanes on two-lane roads. This strategy is intended to reduce the frequency of crashes involving a turning vehicle, which could be classified as head on or rear end. Geometric, traffic, and crash data were obtained for 78 sites (34.9 km (21.3 mi)) in North Carolina, 10 sites (9.7 km (6.0 mi)) in Illinois, 31 sites (10.95 km (6.8 mi)) in California, and 25 sites (21.25 km (13.2 mi)) in Arkansas. Empirical Bayes methods were incorporated in a before-after analysis to determine the safety effectiveness of installing the two-way left-turn lanes (TWLTL's). There was a statistically significant reduction in total and rear-end crashes in each of four States whose installations were evaluated. Rural installations were found to be more effective in reducing crashes than urban ones in each of the four States. Lower cost installations of TWLTL's can be a cost-effective treatment for two-lane rural locations, especially those with a high frequency of rear-end collisions involving a lead vehicle desiring to make a turn"--Technical report documentation page.

Author: Turner-Fairbank Highway Research Center
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 6

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Author: Yi Qi
Publisher:
ISBN:
Category : Right-turn lanes
Languages : en
Pages : 126

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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: James A. Bonneson
Publisher: Transportation Research Board
ISBN: 9780309060677
Category : Technology & Engineering
Languages : en
Pages : 148

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The objective of this research project was to develop a methodology for evaluating alternative midblock left-turn treatments on urban and suburban arterials. The methodology had to be applicable to three common midblock left-turn treatments: the raised-curb median, the flush median with two-way left-turn lane (TWLTL) delineation, and the undivided cross section. The methodology developed for this research focuses on the evaluation of midblock street segments on urban and suburban arterials. The basis for NCHRP Report 395.

Author: Zoltan Anthony Nemeth
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 222

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Author: Weldon James Hoppe
Publisher:
ISBN:
Category :
Languages : en
Pages : 84

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Author: Patrick T. McCoy
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 106

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This report documents the research done to develop guidelines for the use of two-way left-turn lane medians on urban four-lane roadways.

Author: United States. Department of Transportation
Publisher:
ISBN:
Category : Roads
Languages : en
Pages :

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Author: Aemal Jan Khattak
Publisher:
ISBN:
Category : Lane lines (Roads)
Languages : en
Pages : 112

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