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IMHO, some of all of the above -- including the lay of the land and the width of the roads. For instance, Marion (Smyth Co.) to Rural Retreat (Wythe Co.) is about 16 miles/20 minutes, most of it on I-81. Marion to Troutdale (Grayson Co.) is 18 miles, but 30 minutes because it's across the mountain on 2-lane Rt. 16.
Bad weather only increases the time and risk. When I was in HS in Marion, sometimes the school kids bused from Sugar Grove (Smyth, but near the Grayson border on Rt. 16) would get there two hours late and have to leave two hours early. But the schools are cancelled county-wide or not at all.
You'll be a quick-study about it once you've seen the lay of the land. Carroll is definitely too far for a commute to Smyth, but might be okay for parts of Wythe. A lot depends on where the job is and how flexible the schedule is. It's beautiful there in fall, though.
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