Yea, I remember getting stuck in a huge traffic jam and feeling dumb for driving on 66 at rush hour.  Until, I remembered it was Saturday.  In northern VA traffic is often bad at from around 5AM to 10PM.  But, we can have traffic jams at any time day or night 7 days a week.<p>Granted, bad night time traffic is often aided by construction.  But, that does not help when your parked on a freeway at 3AM.