Just a hypothesis. I don't it will be any worst vs. any other game. Even though it is the SuperBowl - the stadium still has a max of capacity which it typically encounters during sold-out games.

I would hope many of the tourist/guest are taking public transportation (as there won't be any local teams) and unlike regular season ticket holders will try to get to stadium to watch the game as they will be freezing. I would even debate traffic might be improved vs. regular Sunday (as everyone is watching game or avoiding northern NJ).

Rt 3, Lincoln, GWB, NJT (exit 14 North) should be avoided (ALL DAY SUNDAY) but outside of increased media crews I would put it in the same category as NYC Marathon - many/most of the guest stay in Manhattan and use public transportation around town. One advantage the game starts in evening - so long afternoon/day for all attendees to get to the stadium.