If you take the 41 to Ballston, heads-up (from ART’s website):
ART 41 Stop on N. Glebe Rd at N. Quincy St. Temporarily Closed
The bus stop on northbound N. Glebe Rd. at N. Quincy St. will be closed due to construction. Riders who use the stop to ride ART 41 or Metrobus 10B and 23 A/C can use the stop located at Glebe Rd. at 4th Rd. N.