A FlyerTalk Posting Legend
Join Date: Feb 2001
Location: Berkeley, CA USA
Programs: Piggly Wiggly "Shop the Pig!" Preferred Shopper
Posts: 57,072
I can't tell you whether taxis would be available, but I'd think it's very likely they will be. Still, if your car rental desk is open that late, I'd just rent at the airport. It's not a long drive to the GW and there will be very little traffic -- you can muster up the energy to do it safely.