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Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 102,617
OP will largely be driving against rush hour until late morning. Near DC, they will have access to the carpool only roads.
For one person, I would suggest the train, but this could be expensive (and crowded) for a family.