It might be optimistic counting the drive as a day of vacation lol. Generally, there are only 3 places where the traffic can get awful. First one is in the Northern part of NJ . . . lots of early morning traffic there, as I am sure you are aware. Best bet I've found is to get on the road either really early, and beat that traffic, OR .. . leave a bit later so rush hour is over already.
Next place that stinks is the DC beltway, starting in the Southern part of Maryland. Generally, that traffic is lighter in August than it is in July, and again, better if you miss the rush hour.
Last place that the traffic stinks is I95 in the Northern part of Virginia. This is typically a lot worse on weekends. Make use of the EZ pass only lanes if the road looks busy, and try to avoid driving on the weekend, and life should be good.
I count our driving days as part of the vacation too