An Assessment of Exclusive/permissive Left-turn Signal Phasing PDF Download
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Author: Michael A. Perfater Publisher: ISBN: Category : Automobile driving Languages : en Pages : 42
Book Description
More than 70% of motorists returning a questionnaire distributed for the study favored the exclusive/permissive signal, while about 17% said the signal reduced delays, and 30% said it created a hazard. Intersections with one or more right-turn-on-red movements seemed especially susceptible to vehicular conflicts. The ratios of accidents involving left-turning vehicles to all accidents at intersections appeared to increase after the E/P signals were installed.
Author: Michael A. Perfater Publisher: ISBN: Category : Automobile driving Languages : en Pages : 42
Book Description
More than 70% of motorists returning a questionnaire distributed for the study favored the exclusive/permissive signal, while about 17% said the signal reduced delays, and 30% said it created a hazard. Intersections with one or more right-turn-on-red movements seemed especially susceptible to vehicular conflicts. The ratios of accidents involving left-turning vehicles to all accidents at intersections appeared to increase after the E/P signals were installed.
Author: Benjamin H. Cottrell Publisher: ISBN: Category : Electronic traffic controls Languages : en Pages : 98
Book Description
The objective of this research was to develop guidelines for the use of exclusive/permissive left-turn signal phasing. This was achieved by collecting data on traffic and roadway conditions for exclusive, exclusive/permissive, and permissive left-turn phasings and then analyzing the data to identify relationships between the left-turn phasings and traffic and roadway conditions. The guidelines addressed the following" (1) volume guidelines based on peak hour minimum left-turn volume and the product of the peak- hour left-turn and opposing volumes, (2) annual left-turn accident experience, (3) left-turn traffic conflict experience based on critical number and rates, (4) left-turn delay, and (5) site condition factors identified in the study
Author: Christopher Lynn Brehmer Publisher: Transportation Research Board ISBN: 0309087570 Category : Information display systems Languages : en Pages : 94
Author: Publisher: ISBN: Category : Left-turn lanes Languages : en Pages : 50
Book Description
In Missouri, multiple left-turns are gaining popularity. However, the installation of these multiple left-turn raises questions for which the Missouri Department of Transportation (MoDOT) has not yet developed answers. Specifically, MoDOT seeks guidance on: Criteria for determining when to install double and triple left-turns. The type of phasing to be used for dual and triple left-turn lanes. Whether to use "Dallas" or permitted lead-lag phasing for any left-turn lanes. Where to begin reducing the number receiving lanes downstream of an intersection with multiple left-turn lanes
Author: F. Adam King Publisher: ISBN: Category : Traffic conflicts Languages : en Pages : 61
Book Description
Selection of the left-turn phasing mode is a significant decision for the safe and efficient movement of left-turning traffic at signalized intersections. Because of different safety and operational effects associated with the signal left-turn mode, the two must be evaluated concurrently and be balanced based on capacity and crash potential when protected-only, permissive-only, and protected-permissive left-turn (PPLT) phasing modes are compared. The choice between left-turn phasing modes can be made on a time-of-day basis so that changing traffic conditions are accommodated appropriately. The purpose of this study was to define guidance that field traffic engineers can use to select the appropriate left-turn mode based on prevailing traffic conditions by time of day. In particular, guidance on the use of PPLT or permissive-only with flashing yellow arrows (FYAs) to indicate permissive movements was of interest to the Virginia Department of Transportation (VDOT). Prior to the development of time-of-day guidance, the overall safety effects of converting between left-turn phase modes and indications (or displays) needed to be explored. The study examined the impact of converting from a circular “green ball” display for the permissive portion of PPLT phasing to the FYA signal indication and converting from protected-only phasing to PPLT with FYA. To quantify these conversions, a before-after evaluation of signal conversions was performed using standard Bayesian methods to develop crash modification factors from field data for 28 intersections in Virginia. For these intersections, the expected crash reduction after conversion from PPLT to PPLT-FYA was estimated as 12 percent (total crashes), 14 percent (fatal and injury crashes), and 30 percent (angle crashes), which was consistent with results from previous studies. In evaluating different left-turn phasing modes on a time-of-day basis, crash risk, left-turn conflicts, and capacity prediction models for permissive-only and PPLT modes were developed using simulation data. A total of 750 unique scenarios based on different combinations of intersection characteristics, traffic signal parameters, and traffic volumes were simulated in VISSIM, and trajectory files were processed using Surrogate Safety Assessment Model software to determine the number of conflicts per scenario. Based on the outputs of the simulation models, prediction models for determining left-turn capacities and the expected number of left-turn conflicts per hour per 100 left-turning vehicles were created using multiple linear regression. A final model predicting the average crash risk per hour based on the predicted number of conflicts was developed. The three models created were incorporated into a single spreadsheet tool that can be used by VDOT engineers in determining phasing mode on a time-of-day basis.
Author: Michael A. Perfater
Author: Michael A. Perfater
Author: M. S. Perfater
Author: Benjamin H. Cottrell
Author: Kenneth R. Agent
Author: Christopher Lynn Brehmer
Author: 
Author: Joseph E. Hummer
Author: Richard Lee Quesenberry
Author: Joseph E. Hummer
Author: F. Adam King