Even though Columbia Pike is a straight shot to the Pentagon, absolutely do not commute on this road in Arlington.
Commuting in the morning on the WOD is actually pretty awesome since it’s downhill for 13 miles to the Pentagon from Vienna. This trail is much more pleasant than the Mt. Vernon wet wood bridges from hell and bumpfest as well. And taking the Custis detour on the way home gives you a nice hill to attack and shake off the work dust.
Lotta folks also head to Hain’s Point for post-work fast laps before heading home as well. Bonus training points for doing it on your commuter bike.