Stadium lots for this game open at 12pm, satellite lots open earlier
Avoid lot P10 if at all possible (huge, limited exit lanes, unpaved sections)
The later you arrive, the less traffic there is (less tailgating time though)
Where are you coming from? If you're south north or east, I'd use Rt 140 to get to Rt 1 and avoid the 4 mile backup.
If you go in early, you can get a place in a premium viewing area. if not, go to the 300 section and view the game from the south EZ.
Feel free to join my tailgate. I should have 8 to 10 people this game. We hook up in Foxboro around 11:45 and carpool to the stadium. These days, it takes about an hour to go a mile on Rt 1 to reach the stadium lots (P7 is my lot of choice now). I bring a good-sized fire pit and keep the crowd warm pre & post game, and leave when they kick us out.