I will be moving out to Herndon, VA and commuting into DC soon. Ideally, I would hop on the W&OD trail at the Sunrise Valley entrance and ride into DC. Some questions:

1) Is this a feasible commute? I'm a roadie right now and I've ridden the trail loads, but riding it for pleasure and commuting are, understandably, two different ballgames.
2) What is traffic on the trail like during commuter hours?
3) Anything else you think I should know?

Thanks guys!