Evaluation of the Safety Performance of the Flashing Yellow Arrow Signal Indication PDF Download
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Author: Min Zhang
Publisher:
ISBN:
Category : Signalized intersections
Languages : en
Pages : 144
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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: 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: Raghavan Srinivasan
Publisher:
ISBN:
Category : Roads—Interchanges and intersections
Languages : en
Pages : 56
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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.
Author: Christopher Lynn Brehmer
Publisher: Transportation Research Board
ISBN: 0309087570
Category : Information display systems
Languages : en
Pages : 94
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Book Description
Author: Raghavan Srinivasan
Publisher: Transportation Research Board
ISBN: 0309213452
Category : Technology & Engineering
Languages : en
Pages : 48
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Book Description
TRB’s National Cooperative Highway Research Program (NCHRP) Report 705: Evaluation of Safety Strategies at Signalized Intersections explores crash modification factors (CMFs) for safety strategies at signalized intersections. CMFs are a tool for quickly estimating the impact of safety improvements.
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: Florida. Department of Transportation. Research Center
Publisher:
ISBN:
Category : Traffic signs and signals
Languages : en
Pages : 89
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Book Description
There is a need to develop an interactive and efficient framework to serve as a decision support system (DSS) for the evaluation of left-turn phasing alternative based on intersection conditions. This framework will allow (1) an interactive evaluation of left-turn phasing and ultimately recommend phasing mode by time-of-day and (2) Traffic Management Center (TMC) data to be fed into the DSS so that intersections requiring attention/modification of left-turn mode can be flagged. The current study develops an interactive DSS for assessing the likely benefits of warranting a permitted left-turn phase using custom design approach. The developed DSS is designed to predict these benefits based on multilevel factorial parameters that are practical and applicable to assist TMCs in evaluating the efficiency of a permitted left-turn phase by time of day.
Author: David S. Hurwitz
Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 66
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Book Description
In some jurisdictions, protected left-turn phasing has been replaced with the flashing yellow arrow (FYA) for protected/permissive left turns (PPLTs) to reduce delay. However, it is important to have a thorough understanding of the conflict between pedestrians and the permissive left-turning vehicle. This presentation summarizes the results of research conducted with a high-fidelity, motion-based driving simulator and mobile eye-tracking equipment to study the effects of the opposing traffic, the presence and walking direction of pedestrians, and the number of section heads to display the FYA on driver performance. To accomplish this research, a six-intersection simulated environment was created. In total, 27 subjects completed the course, allowing the analysis of 620 permissive left-turn maneuvers. Eye-glance durations for the intersection approach and turning maneuver were captured for left-turn pavement bay markings, the signal indication, the pedestrian and vehicle waiting area, and the pedestrian signal heads. The total glance durations for each of these areas were analyzed. The following results were obtained: 1) the increased presence of pedestrians led drivers to focus more attention on these crossing pedestrians; 2) as the number of opposing vehicles increased, drivers spent less time fixating on pedestrians; 3) Four to seven percent of drivers did not focus on pedestrians in the crosswalk; and 4) there did not appear to be a difference between any variable and the presence of a three- or four-section head. In terms of practice, the results suggest that it may be desirable to limit the permissive operation when pedestrians are present. Moreover, the findings may indicate that the additional cost of four-section heads is not justified.
Author:
Publisher:
ISBN:
Category : Traffic signal preemption
Languages : en
Pages :
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Book Description
University of Central Florida researchers continued a project to increase the effectiveness of flashing yellow arrow (FYA) signals by developing hardware that can interface with a wide variety of controllers and software to automatically select left-turn modes, in real time, based on gaps in opposing traffic and using existing sensors.
