Advanced traffic management systems allow video image detection to supplement and improve data inputs in transportation modeling efforts. Video detection systems use machine vision technology, the interaction of video cameras, and specialty computer hardware and software to measure traffic. Traffic parameters such as hourly flows, density, vehicle speed, level of service, and other parameters derived from measured and default values are automatically computed. However, the accuracy of video image detection systems is dependent upon factors such as the camera height, location, and angle above the roadway. Environmental factors such as rain, sun intensity, and day/night also affect vehicle detection accuracy. Existing transportation models can benefit from video image detection technology and improved travel demand models can be developed from such data, providing video detection is accurate. This paper examines how transportation models can benefit from video data. A commercially available system is used t...
The characteristic of vehicle arrival at intersection is of great importance to the adjustment of signal timing, however, the vehicle arrival rate can't be detected accurately by traditional loop detection due to technical limit. In recent years, video technology has been applied to the traffic control detection, it will bring revolutionary change to the traffic control algorithm. This study takes advantage of video technology to obtain reliable vehicle arrival rate. With the vehicle arrival pattern obtained by pattern recognition technology, the timing parameters will be calculated. The vehicle delay will be reduced by adjusting the timing parameters according to the real-time traffic flow information. At last, a simulation study is conducted for example analysis, and the simulated result shows that this approach is practical and feasible. It will offer the reliable theoretical foundation for the further study of traffic control.
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.