post today about a class project I just finished in which I made a thematic map concerning the TIGER ways in Kansas.
Great analysis - I did something similar for Arkansas, but it was statewide and not county by county. I concur with your analysis - we need to retain interstate and US highway edits where global routability has been created. Approaching it on a county by county basis is a good plan also; that will give us a chance to stitch up the county borders on all roads this time as counties are updated. That will be a HUGE project - keep in mind that some *major* interstate routes have finally been converted to dual carriageway just last week.
As far as how to approach the TIGER 2010, some advanced conflation tools will be needed / welcome. Something that can produce just a Geo-Diff set of data, or allow virtual tracing over the new information as required. I haven't seen the data, so I can't guess what can be done, but since I have extensively modified my area, I envision just doing adds / deletes, and if they have updated old stuff with actual county centerlines, I can replace just areas created from "back of napkin style" geometries that you have seen in your area.
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