Abstract
This paper discusses the travel time reliability of road network under ice and snowfall conditions. With the introduction of correction function for the influence of ice and snowfall conditions on free travel time and capacity, the function of travel time was established. According to the limitation of the current travel time reliability, the new definition was defined on the basis of quantifying the relationship between LOS (Level of Service) and travel time reliability. The breakthrough of the traditional idea that the route travel time reliability model was set by general series system was made by considering the route as a whole unit; instead of using a paralleling system; another breakthrough was made to calculate the weighted average travel time reliability of OD (Original Destination) pair. On the basis of OD pair travel time reliability, the road network reliability model was set up. A partial road network was taken as an example to validate the effectiveness and practicality of the evaluation methodology.
Highlights
Compared with the connection reliability, the study on travel time reliability started later
A partial road network was taken as an example to validate the effectiveness and practicality of the evaluation methodology
The observation data of free travel time and capacity of the different road segments are showed in Table 1 and Table 2, respectively, and the value of gt ^ I h and gc ^ I h can be found in Table 3 and Table 4, respectively
Summary
Compared with the connection reliability, the study on travel time reliability started later. Asakura et al [1] suggested reflecting the road network reliability with the volatility of travel time, i.e. the concept of travel time reliability. It was defined as the ratio between the practical travel time and the free travel time between the given OD pair. This paper aims to study the travel time reliability of urban road network under ice and snowfall conditions, which provides theoretical support for improving the road network planning, disaster relief and prevention, as well as traffic management. The following section establishes the models of road segment travel time and delay at intersection under ice and snowfall conditions. The final section concludes the paper and recommends the followup
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