Evaluation of Flashing Yellow Arrow Traffic Signals in Indiana PDF Download
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Author: Robert Rescot
Publisher:
ISBN: 9781622603480
Category :
Languages : en
Pages :
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Book Description
The evaluation of Flashing Yellow Arrow signals for widespread implementation was evaluated. Through the collection of field driver performance data, survey data, crash data, at two test sites in the State, it was concluded that this is a worthwhile practice to be considered for a larger scale deployment. The return on investment includes both increased safety, and improved mobility. Given Indiana's widespread usage of span and catenary signal supports, installation could be simplified to place a larger four section flashing yellow head in a horizontal orientation while leaving adjacent through lane three section signal heads in a vertical alignment, and not decrease the standard of care provided to the public, given proper engineering judgment.indeed
Author: Robert Rescot
Publisher:
ISBN: 9781622603480
Category :
Languages : en
Pages :
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Book Description
The evaluation of Flashing Yellow Arrow signals for widespread implementation was evaluated. Through the collection of field driver performance data, survey data, crash data, at two test sites in the State, it was concluded that this is a worthwhile practice to be considered for a larger scale deployment. The return on investment includes both increased safety, and improved mobility. Given Indiana's widespread usage of span and catenary signal supports, installation could be simplified to place a larger four section flashing yellow head in a horizontal orientation while leaving adjacent through lane three section signal heads in a vertical alignment, and not decrease the standard of care provided to the public, given proper engineering judgment.indeed
Author: Kailas Venkitasubramanian
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Book Description
This thesis evaluated the effectiveness of flashing yellow arrow (FYA) permitted left-turn signals in reducing conflicts and events at intersections. A FYA permissive signal is a recent treatment used as an alternate to circular green signal at signalized intersections. It is the newest addition to the series of permitted left-turn signal indicators and has been designed to improve the clarity of indication among drivers. The signal is expected to result in safer turning movements during the permitted phase. Conflict data was collected during morning peak period (7:00 AM to 9:00 AM) and evening peak period (4:00 PM to 8:00 PM) at four study intersections in Charlotte. Data was collected before the installation of FYA signal was introduced and after one month, three months and six months of installation of FYA. Relevant types of conflicts and events associated with left-turn maneuver were observed and recorded. Descriptive statistics, proportions of conflicts/events and statistical tests were conducted to analyze the data collected. Conflicts and events were also analyzed separately for each intersection using various comparison sets to understand their trend over time and the impact of FYA on them. Observations and analysis indicated that benefits in terms of reduction in conflicts and events are substantial at 7th Street / 5th Street intersection and Mallard Creek Church Road / 1-85 Southbound interchange but are marginal and currently statistically insignificant at Sunset Road / 1-77 interchanges. Overall, FYA leaves a positive effect on the intersection safety, helps reduce vehicular conflicts/events and is suitable for application at other intersections in the future.
Author: Hasan Ozer
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 91
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Book Description
Author:
Publisher:
ISBN:
Category : Traffic signs and signals
Languages : en
Pages : 124
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Book Description
A determination of the differences between flashing yellow and circular green permissive signal indications displayed to motorists in a separate left turn lane with a separate indication.
Author:
Publisher:
ISBN:
Category : Traffic safety
Languages : en
Pages : 103
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Book Description
The primary objective of this research was to evaluate the safety of the flashing yellow arrow (FYA) permissive only left-turn indication field installations. The ability of the FYA indication to improve safety was evaluated with respect to crash experience. Findings of the crash analysis were interpreted with respect to other variables such as signal phasing, vehicle flow rates, posted speed limits, and intersection geometry. The scope of this research included all known installations of the FYA prior to the commencement of this research.
Author: Kerrie L. Schattler
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 33
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Book Description
In spring 2010, the Illinois Department of Transportation initiated an areawide implementation of the flashing yellow arrow (FYA) as the display for the left-turn permissive interval at more than 100 intersections operating with protected/permissive left-turn (PPLT) control in the Peoria, Illinois, area. Bradley University researchers evaluated the effectiveness of FYAs on driver comprehension and traffic operations. A total of 363 drivers completed an online static survey that included seven left-turn scenarios that portrayed the protected and permissive indications of PPLT phasing, with the flashing modes being animated. The results of the survey indicated that drivers had a high comprehension of both the circular green (CG) and FYA permissive left-turn indications. However, the survey results provided evidence of some drivers' misinterpreting the meaning of a permissive left-turn with CG display and incorrectly and unsafely interpreting the meaning as "go" under some circumstances. With supplemental traffic signs present, drivers' understanding of the correct action to take when confronted with a FYA significantly increased, and the percentage of fail-critical, incorrect "go" responses significantly decreased. Before and after field observations, including 128 hours of data collected at 16 study approaches, were collected; and the following variables were investigated: critical gap, left-turn red-light running and yellow-light running, and traffic conflicts.Overall, the findings of this study suggest that drivers in the Peoria, Illinois, area had high comprehension and acceptance of the FYA message. Additionally, the FYA did not appear to have any negative impacts on traffic operations.
Author: Meshal Ibrahim Almoshaogeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 289
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Book Description
In the United States, there are two schemes of operating traffic signal controls for permitted protected left turns (PPLT) namely the traditional five-section head system (known as Dog-House) and the flashing yellow arrow system (FYA). Past studies have agreed that these controls lead to decrease the average delay per left turn vehicle, decrease the protected green time, increase the left turn capacity, and enhance the intersection overall operation. The flashing yellow arrow (FYA) has been approved by the Federal Highway Administration as the national standard for the PPLT operations at signalized intersections. So, the Florida Department of Transportation also approved this new system and they are extensively replacing the traditional system with the new system on the area of Central Florida (Lin, et al, 2010). Both these systems have been used for a long time and there are some studies that evaluated these systems but there are limited number of projects that evaluated and/or compared between the two PPLT systems from the operational perspective.
Author: Patrick A. Gibson
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
Author: Min Zhang
Publisher:
ISBN:
Category : Signalized intersections
Languages : en
Pages : 144
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Book Description
Author: Raghavan Srinivasan (Transportation engineer)
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 54
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Book Description
This study evaluated the safety effect of the flashing yellow arrow (FYA) treatment at signalized intersections. The major objective of this strategy is to reduce the frequency of left-turn (LT) crashes, especially those that involve a collision between left turns and vehicles traveling straight through from the opposite direction. The project team conducted an empirical Bayes before-after analysis of installations in Nevada, North Carolina, Oklahoma, and Oregon. The treatments were divided into seven categories depending on the phasing system in the before and after periods, number of roads where FYAs were implemented, and number of legs at each intersection. The first five categories involved permissive or protected-permissive phasing in the before period. Intersections in these five treatment categories experienced a reduction in the primary target crashes under consideration: LT crashes and left-turn-with-opposing-through (LTOT) crashes at the intersection level. The reduction ranged from 15 to 50 percent depending on the treatment category. Intersections in categories 6 and 7 had at least one protected LT phase in the before period, and after phasing had an FYA protected-permissive LT phase without time-of-day operation (category 6) and with time-of-day operation (category 7). Consistent with results from previous studies, these intersections experienced an increase in LT and LTOT crashes. The B/C ratios for categories 1-5 ranged from 56:1 to 144:1.
