Old Salt,
Sorry I can not comment on road conditions but will offer this detour from Harrisburg to Fredericksburg, VA.
Interstate route is 173 miles
This detour route is 165 miles
81 south to 581 in Harrisburg.
581 to 15 south in Camp Hill
15 south through Fredrick, MD to Warrenton VA
17 south to Fredericksburg, VA
95 south.
This bypasses Baltimore and Washington DC.
This detour route is 183 miles
Other options is to stay on 81 south to Winchester, VA
Nice campground Candy Hill for an over night stop.
Pick up 17 there and take it to Fredericksburg. Less two lane traffic.
I hope this helps. Safe travels.
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