open access

https://hdl.handle.net/2115/8503

Transformation between uninterrupted and interrupted speeds for urban road applications

英語

shock wave

2005

Transportation Research Board

Transportation Research Record

1934

72-82

Unlike the freeway traffic stream, the urban traffic stream is generally interrupted by signals, and the traffic data observed may differ from the true (uninterrupted) flow characteristics. This paper deals with the transformation between interrupted and uninterrupted speeds on an urban road with signalized intersections. The conventional shock wave model and two modified versions of the shock wave boundary that address unrealistic characteristics of the conventional shock wave model are developed. A method of integrating probe and detector data for speed transformation is also discussed. The proposed methods are tested with a virtual isolated signalized intersection by varying the approach demand. The numerical results suggest that all models can significantly reduce the difference between the actual and the estimated uninterrupted (or interrupted) speeds compared with the case of doing nothing. The applications of the proposed methods, including the development of a flow-speed model and link travel time estimation, are also given. Limitations of the model are explained, and the areas of potential improvement are suggested.

学術雑誌論文

Accepted Manuscript

An edited version of this paper was published in Transportation Research Record: Journal of the Transportation Research Board, No. 1934, pp. 72-82, (2005). For more information, contact Transportation Research Board of the National Academies, Washington, D.C., www.TRB.org.

0361-1981