The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
People tend to know whether the traffic flow state in their desired route is smooth or the unblocked degree of traffic flow state in real life. To quantitatively measure the unblocked degree of traffic flow states for urban freeway, traffic flow states identification was firstly studied with fuzzy mathematics using speed data of urban freeway in Beijing, which were obtained from video capture technique...
At present, research on traffic flow theory has mainly focused on highway traffic, which is significantly different from urban freeway traffic. Traffic science is an "empirical science", and as such is it is based on empirical urban freeway traffic flow data. In this study, first four steady phases are identified in the flow-density plane of traffic flow: free flow, coherent-moving flow,...
Bottlenecks at highway or urban freeway are one of origins of traffic congestion. Based on empirical investigation on field data of Beijing urban freeway, schematic phase diagram at on-ramp vicinity is developed and detailed phase transition processes are investigated. There are five phases in the phase diagram of on-ramp vicinity in connection with on-ramp flow and upstream flow, among which are...
In this paper, traffic features of urban ring road are investigated based on empirical data of Beijing 2nd Ring Road. According to the concept of "synchronized flow" as well as the stability and synchronization among lanes around critical density, four traffic phases are identified: free flow, high-speed synchronized flow, low-speed synchronized flow and traffic jam. Moreover, spatio-temporal...
In the context of serious congestion in most metropolitan areas and the development of intelligent transportation technology, variable message signs (VMS), as a part of route guidance system, are developed to alleviate congestion via providing drivers real-time travel information. It is expected that by providing dynamic travel time to drivers, both the congestion in network and average individual...
A combination forecasting model of urban ring road traffic flow based on neural network, Kalman filter and ARIMA model is proposed in this paper, and the traffic flow data of Beijing third-ring-road (BTRR) are explored to test the validity of the model. The experimental results show that combination forecasting cannot improve the forecasting precision in contrast to which ARIMA model and neural network...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.