Author: Stuart R. Perkins
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 38
Book Description
Criteria for Traffic Conflict Characteristics Signalized Intersections
Author: Stuart R. Perkins
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 38
Book Description
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 38
Book Description
Traffic Conflict Characteristics
Author: Stuart R. Perkins
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 62
Book Description
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 62
Book Description
Traffic Conflict Characteristics
Traffic conflict characteristics
Development of Safety-based Level-of-service Criteria for Isolated-signalized Intersections
Criteria for Traffic Conflict Characteristics
Author: Stuart R. Perkins
Publisher:
ISBN:
Category : Traffic flow
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category : Traffic flow
Languages : en
Pages :
Book Description
Traffic Conflict Characteristics - Accident Potential at Intersections
Author: Northwestern University (Evanston, Ill.). Traffic Institute
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Analysis of the Relationship Between Traffic Conflicts and Level of Service at Four-legged, Signalized Intersections in Sacramento
Author: Addisu Abebe Workineh
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
Book Description
The project evaluates the relationship between traffic delays and vehicle conflicts to explore if traffic conflict techniques can be used to assess the performance of roadway systems. Seven signalized intersections located in the Sacramento area were selected on the basis of geometric similarity, signal timing, and traffic characteristics. The morning peak hours of 6:30 a.m. to 10:00 a.m., Monday through Thursday, were chosen to collect traffic conflict and volume data for this study. Signal timing and phasing for the seven selected intersections were obtained from the Departments of Transportation of the County of Sacramento and the City of Sacramento. The geometric characteristics of the selected sites were acquired from Google Earth. A review of previous research was conducted to identify the best methodology for this study. The peak-hour traffic volume, signal timing, and geometry of the intersections were entered into Synchro traffic analysis software. The resulting output was the average delay data for all seven intersections during the study period. A regression analysis was conducted to assess the correlation between intersection conflicts and average delay. The study found that individual movements show an inconsistent relationship between conflict and delay. The study revealed significant relationships between left movement conflicts and left movement delay, and slow vehicle movement conflicts and through movement delay. In contrast, the study found insignificant relationships between right movement conflicts and right movement delay, and lane change conflicts and through movement delay. The relationship of total number of conflict and total delay also show insignificant relationship with a coefficient of determination (R2 = 0.04), which suggests that the total number of conflicts explains only 4 percent of the total variation in delay. As a result, it was determined that traffic conflict techniques alone cannot be used as a good proxy to assess the level of service of signalized intersections.
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
Book Description
The project evaluates the relationship between traffic delays and vehicle conflicts to explore if traffic conflict techniques can be used to assess the performance of roadway systems. Seven signalized intersections located in the Sacramento area were selected on the basis of geometric similarity, signal timing, and traffic characteristics. The morning peak hours of 6:30 a.m. to 10:00 a.m., Monday through Thursday, were chosen to collect traffic conflict and volume data for this study. Signal timing and phasing for the seven selected intersections were obtained from the Departments of Transportation of the County of Sacramento and the City of Sacramento. The geometric characteristics of the selected sites were acquired from Google Earth. A review of previous research was conducted to identify the best methodology for this study. The peak-hour traffic volume, signal timing, and geometry of the intersections were entered into Synchro traffic analysis software. The resulting output was the average delay data for all seven intersections during the study period. A regression analysis was conducted to assess the correlation between intersection conflicts and average delay. The study found that individual movements show an inconsistent relationship between conflict and delay. The study revealed significant relationships between left movement conflicts and left movement delay, and slow vehicle movement conflicts and through movement delay. In contrast, the study found insignificant relationships between right movement conflicts and right movement delay, and lane change conflicts and through movement delay. The relationship of total number of conflict and total delay also show insignificant relationship with a coefficient of determination (R2 = 0.04), which suggests that the total number of conflicts explains only 4 percent of the total variation in delay. As a result, it was determined that traffic conflict techniques alone cannot be used as a good proxy to assess the level of service of signalized intersections.
Traffic Conflict Techniques for Safety and Operations
Author: Martin R. Parker
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 116
Book Description
Based on previous research and experiences, the procedures described in this guide provide a standard, cost effective method for using traffic conflicts to diagnose safety and operational problems at intersections. The guide contains definitions with illustrations and examples of conflict types, step by step procedures for conducting a conflict study, methods for analyzing and interpreting the data, and guidelines for using conflict data to select countermeasures. Because the reliability of conflict data is dependent upon the ability of the observers to record conflicts accurately, a section of the guide is devoted to training data collectors. Also available, as a training aid and reference source, is an observer's manual.
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 116
Book Description
Based on previous research and experiences, the procedures described in this guide provide a standard, cost effective method for using traffic conflicts to diagnose safety and operational problems at intersections. The guide contains definitions with illustrations and examples of conflict types, step by step procedures for conducting a conflict study, methods for analyzing and interpreting the data, and guidelines for using conflict data to select countermeasures. Because the reliability of conflict data is dependent upon the ability of the observers to record conflicts accurately, a section of the guide is devoted to training data collectors. Also available, as a training aid and reference source, is an observer's manual.