Impacts of Traffic Divisional Island Installation Pattern on Traffic Safety, Travel Speed and Street Scene
Date Issued
2005
Date
2005
Author(s)
Lai, Shu-Fang
DOI
zh-TW
Abstract
An urban arterial street can be designed as undivided, centrally divided for separating opposing traffic, or laterally divided for separating fast moving vehicles from slow moving ones. Various patterns of installing traffic divisional island have different impacts on traffic safety, vehicle travel speed, street scene, and street width. The objective of this study is to investigate factors affecting the performance of undivided urban streets, centrally divided streets and laterally divided streets in terms of traffic safety, users’ preference and travel speed. Accident rate and accident severity were used to reflect traffic safety. The degree of likeness was used to reflect User’s preference. Weighted average vehicle travel speed of each traffic lane was used to reflect the average speed of that road section. VISSIM, a microscopic traffic simulation model was adopted to analyze effects of traffic volume, traffic composition, ratio of right-turning vehicles, and speed variation.
In terms of traffic safety, the difference between centrally divided street and laterally divided street in traffic safety is insignificant. In terms of user’s preference, a survey was conducted with the assistance of computer animation to simulate visions of road users. Preference of both drivers and pedestrians were investigated. Methods of Regression Analysis, Cluster Analysis, and Multidimensional Scaling were used to analyze surveyed data. The results showed that drivers’ preference was affected by aesthetics of street, the number of tree allocation, trees planted on left-side of sidewalk and the shortest distance to tree. As for pedestrians, their cognition features were safety, tree planted on division strip and sidewalk, tree planted on left-side of sidewalk, and comfortable. The results also showed that both of drivers’ and pedestrians’ preference were not affected by divided type of urban arterials. In terms of average travel speed, a Binary Logistic Model was established for statistical analysis. It was found that traffic composition, ratio of right-turning vehicles, and speed variation are major affecting factors for determining type of divided urban streets. It was also concluded that laterally divided streets are more suitable for highly mixed traffic, high speed variations, and low ratio of right-turning vehicles.
This study provided important information on designing urban arterial streets. It also presented a new approach for preference survey and data analysis in the field of transportation.
Subjects
市區幹道
分隔島
肇事率
景觀偏好
羅吉斯模式
Urban Arterial
Traffic Island
Accident Rate
Logistic Model
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-94-D89521021-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):291468851f0447cf081834a87d9b8796