Abstract
To estimate arterial link traffic condition based on probe vehicles, it is necessary to investigate the fluctuation characteristics of road travel time with traffic condition. On the basis of micro traffic simulation model, this paper analyzes the fluctuation of road travel time with traffic condition, and examines whether the mean travel time can reflect the variation of traffic conditions including free flow, congestion to traffic jam. As a conclusion, (1) mean link travel time can be used to identify free flow, congestion, and traffic jam; (2) mean link travel time divides congestion condition, but cannot subdivide free flow condition; (3) in the condition of congestion, travel time is distributed as a two-peak mode, and the average travel time is difficult to be estimated by small size sample.
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