[Routing] Tiger Data and Routing

[Charley Hughes]

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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