I was thinking of using openstreetmap as a data source for a routing application but found that most of the data in my area is imported from the Tiger census data. This data does not distinguish between overpasses and intersections. Some future iteration of the tiger data may include information about overpasses and underpasses, but for now, every line that crosses another has a node joining them, even if they are different types of lines, roads, railways, rivers. This data is in the openstreetmap database in this same form.
I suppose one could look at the type of line to keep from routing a car down a railway, but the under and overpasses look like routable elements when there is no way to actually traverse them. Has anyone encountered and solved this?
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