One option for implementing a dynamic cost surface is to use a continuously updated network, where the latest available data at the starting time of travel is used, and where the cost of travel does not change during the duration of the estimated route. Another option is to establish a network with varying travel cost per pre-defined time interval. In this case the travel cost is dependent on the starting time of travel, and the travel cost changes when the estimated route passes from one time interval to another.
In practice, the first approach involves building an application that passes on values to the cost surface used in a raster-based GIS for calculating the fastest path in a network.
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