Cost-effectiveness Evaluation of Two-way Left-turn Lanes on Urban Four-lane Roadways PDF Download
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Author: Patrick T. McCoy Publisher: ISBN: Category : Highway engineering Languages : en Pages : 106
Book Description
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: Patrick T. McCoy Publisher: ISBN: Category : Highway engineering Languages : en Pages : 106
Book Description
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: Publisher: ISBN: Category : Left-turn lanes Languages : en Pages : 39
Book Description
"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: Patrick T. McCoy Publisher: ISBN: Category : Highway planning Languages : en Pages : 204
Book Description
A study of turning lanes on uncontrolled approaches of rural intersections. Construction and maintenance costs, safety, and guidelines used to warrant turning lane construction based on traffic volumes are included.
Author: James A. Bonneson Publisher: Transportation Research Board ISBN: 9780309060677 Category : Technology & Engineering Languages : en Pages : 148
Book Description
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: Keith K. Knapp Publisher: ISBN: Category : Left-turn lanes Languages : en Pages : 112
Book Description
At and above 1,750 vehicles per hour, the simulation indicated a reduction in arterial level of service. Therefore, at least in Iowa, the feasibility of a four-lane undivided to three-lane conversion should be questioned and/or considered much more closely when a roadway has (or is expected to have) a peak-hour volume of more than 1,750 vehicles. Assuming that 10 percent of the daily traffic occurs during the peak-hour, these volume recommendations would correspond to 15,000 and 17,500 vehicles per day, respectively. These suggestions, however, are based on the results from one idealized case xi study corridor analysis. Individual operational analysis and/or simulations should be completed in detail once a four-lane undivided to three-lane cross section conversion is considered feasible (based on the general suggestions above) for a particular corridor. All of the simulations completed as part of this project also incorporated the optimization of signal timing to minimize vehicle delay along the corridor. A number of determination feasibility factors were identified from a review of the past research, before-and-after case study results, and the simulation sensitivity analysis. The existing and expected (i.e., design period) statuses of these factors are described and should be considered. The characteristics of these factors should be compared to each other, the impacts of other potentially feasible cross section improvements, and the goals/objectives of the community. The factors discussed in these guidelines include - roadway function and environment - overall traffic volume and level of service - turning volumes and patterns - frequent-stop and slow-moving vehicles - weaving, speed, and queues - crash type and patterns - pedestrian and bike activity - right-of-way availability, cost, and acquisition impacts - general characteristics, including - parallel roadways - offset minor street intersections - parallel parking - corner radii - at-grade railroad crossings xii The characteristics of these factors are documented in these guidelines, and their relationship to four-lane undivided to three-lane cross section conversion feasibility identified. This information is summarized along with some evaluative questions in this executive summary and Appendix C. In summary, the results of past research, numerous case studies, and the simulation analyses done as part of this project support the conclusion that in certain circumstances a four-lane undivided to three-lane conversion can be a feasible alternative for the mitigation of operational and/or safety concerns. This feasibility, however, must be determined by an evaluation of the factors identified in these guidelines (along with any others that may be relevant for a individual corridor). The expected benefits, costs, and overall impacts of a four-lane undivided to three-lane conversion should then be compared to the impacts of other feasible alternatives (e.g., adding a raised median) at a particular location.
Author: Patrick T. McCoy
Author: Patrick T. McCoy
Author: 
Author: 
Author: Patrick T. McCoy
Author: James A. Bonneson
Author: Patrick T. McCoy
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Author: Jerome S. Gluck
Author: Tapan K. Datta
Author: Keith K. Knapp