With the increasing number of vehicles in large-and medium-sized cities challenges in urban traffic management, control, and road planning are being faced. Taxi GPS trajectory data is a novel data source that can be u...With the increasing number of vehicles in large-and medium-sized cities challenges in urban traffic management, control, and road planning are being faced. Taxi GPS trajectory data is a novel data source that can be used to study the potential dynamic traffic characteristics of urban roads, and thus identify locations that show a notable lack of road planning. Considering that road traffic characteristics on their own are insufficient for a comprehensive understanding of urban traffic, we develop a road traffic characteristic time series clustering model to analyze the relationship between urban road traffic characteristics and road grade based on existing taxi trajectory data. We select the main urban area of Nanjing as our study area and use the taxi trajectory data of a single month for evaluating our method. The experiments show that the clustering model exhibit good performance and can be successfully used for road traffic characteristic classification. Moreover, we analyze the correlation between traffic characteristics and road grade to identify road segments with planning designs that do not match the actual traffic demands.展开更多
Speed is of great importance to the safety level of a road. Speed choice is strongly influenced by the road environment and the drivers＇ assessment of safe speed level at a specific location. This paper presents an a...Speed is of great importance to the safety level of a road. Speed choice is strongly influenced by the road environment and the drivers＇ assessment of safe speed level at a specific location. This paper presents an analysis of the relationships between speed and road characteristics and speed and driver characteristics. The analysis is based on big data on speed and driver characteristics combined with data on road characteristics on 49 secondary rural two-lane roads in Denmark. Data is modelled using multivariate linear regression. The results show a primarily influence from road and shoulder width, the extent of road markings and the section lengths on speed. Secondly, they also show the presence of woodland and intersections influencing speed as gender, age of vehicle and time of day do.展开更多
The first Beijing Forum on Human Rights was held by the China Society for Human Rights Studies（CSHRS） from April 21-23, 2008. Following is the speech made by Luo Haocai, President of CSHRS, at the opening ceremony o...The first Beijing Forum on Human Rights was held by the China Society for Human Rights Studies（CSHRS） from April 21-23, 2008. Following is the speech made by Luo Haocai, President of CSHRS, at the opening ceremony on April 21.展开更多
This paper makes a comprehensive analysis of the building of public library service brands in China since the initiation of the reform and opening up in 1978 and anticipate their future development in five aspects,i.e...This paper makes a comprehensive analysis of the building of public library service brands in China since the initiation of the reform and opening up in 1978 and anticipate their future development in five aspects,i.e.,critical interpretation of its established culture and analysis of its characteristics,logic of the time,vivid practice,virtuous approaches,as well as future development.展开更多
基金Under the auspices of National Natural Science Foundation of China(No.41571377)
文摘With the increasing number of vehicles in large-and medium-sized cities challenges in urban traffic management, control, and road planning are being faced. Taxi GPS trajectory data is a novel data source that can be used to study the potential dynamic traffic characteristics of urban roads, and thus identify locations that show a notable lack of road planning. Considering that road traffic characteristics on their own are insufficient for a comprehensive understanding of urban traffic, we develop a road traffic characteristic time series clustering model to analyze the relationship between urban road traffic characteristics and road grade based on existing taxi trajectory data. We select the main urban area of Nanjing as our study area and use the taxi trajectory data of a single month for evaluating our method. The experiments show that the clustering model exhibit good performance and can be successfully used for road traffic characteristic classification. Moreover, we analyze the correlation between traffic characteristics and road grade to identify road segments with planning designs that do not match the actual traffic demands.
文摘Speed is of great importance to the safety level of a road. Speed choice is strongly influenced by the road environment and the drivers＇ assessment of safe speed level at a specific location. This paper presents an analysis of the relationships between speed and road characteristics and speed and driver characteristics. The analysis is based on big data on speed and driver characteristics combined with data on road characteristics on 49 secondary rural two-lane roads in Denmark. Data is modelled using multivariate linear regression. The results show a primarily influence from road and shoulder width, the extent of road markings and the section lengths on speed. Secondly, they also show the presence of woodland and intersections influencing speed as gender, age of vehicle and time of day do.
文摘The first Beijing Forum on Human Rights was held by the China Society for Human Rights Studies（CSHRS） from April 21-23, 2008. Following is the speech made by Luo Haocai, President of CSHRS, at the opening ceremony on April 21.
文摘This paper makes a comprehensive analysis of the building of public library service brands in China since the initiation of the reform and opening up in 1978 and anticipate their future development in five aspects,i.e.,critical interpretation of its established culture and analysis of its characteristics,logic of the time,vivid practice,virtuous approaches,as well as future development.
