Originally Posted by cc_rider
From Ballston go to the Custis Trail, west to the W&OD and keep going.
The LONG way would be W&OD to the Fairfax County Parkway in Reston and take the Parkway sidepath to Fair Lakes.
Mileage - about 16 to Reston, 9 or 10 down the Parkway.
You just described my commute exactly. FF County Parkway trail runs through my backyard, and I work in Ballston. 23.5 miles -- usually about 90 minutes.