| Title |
A New Approach to the Parameter Calibration of Two-Fluid Model |
| Authors |
권영범(Kwon, Yeong-Beom) ; 이재현(Lee, Jaehyeon) ; 김선호(Kim, Sunho) ; 이청원(Lee, Chungwon) |
| DOI |
https://doi.org/10.12652/Ksce.2019.39.1.0063 |
| Keywords |
거시교통류;도시가로망;교통공학;택시 DTG 자료 Two-fluid model;Macroscopic traffic flow;Urban network;Traffic engineering;Taxi digital tacho graph data |
| Abstract |
The two-fluid model proposed by Herman and Prigogine is useful for analyzing macroscopic traffic flow in a network. The two-fluid model is used for analyzing a network through the relationship between the ratio of stopped vehicles and the average moving speed of the network, and the two-fluid model has also been applied in the urban transportation network where many signalized or unsignalized intersections existed. In general, the average travel speed and moving speed of a network decrease, and the ratio of stopped vehicles and low speed vehicles in network increase as the traffic demand increases. This study proposed the two-fluid model considering congested and uncongested traffic situations. The critical velocity and the weight factor for congested situation are calibrated by minimizing the root mean square error (RMSE). The critical speed of the Seoul network was about 34 kph, and the weight factor of the congestion on the network was about 0.61. In the proposed model, $R^2$ increased from 0.78 to 0.99 when compared to the existing model, suggesting that the proposed model can be applied in evaluating network performances or traffic signal operations. |