Due to living in the middle of nowhere in NH, I take Rt 101 to Rt 125 in Epping. I don't know about traffic south of Epping, but as Kenn says, the traffic/drive north of Rt 101 is not bad at all. Be sure and wave when you drive by the Cedar Waters Village Nudist Park in Epping/Nottingham! (Actually, there is just a sign for it on Rt 125).
Glad to see the June 30 launch is moved to July 7, 2012.
Open road tolling at Hampton NH (I-95 exit 2 in NH) was opened in May 2010 (before the 1st airshow). Thats a factor, but not the critical path. Once you get past the tolls, the bottleneck is NH-16 (Spaulding Tpk) backing up onto I-95 N in Portsmouth, blocking all 4 lanes, so you cant get easily to Maine and take ME-236 in Berwick. NH-16 exit 1 in Newington, NH is the primary airshow route to the airshow.
From what I have seen and heard about the success of the open road tolling greatly reducing or eliminating the holioday backups at the Hamption tolls, I knew there had to be another reason why the air show trafic was a mess.
A backup from exit 1 on Rt-16 blocking RT-95 North traffic explains what happens.
You are correct. Open road tolling has been awesome on the Nh Seacoast. It has eliminated almost all the summer weekend traffic nightmares. When I worked in Acton, Friday traffic would spill from Nh down I495 into Mass, sometimes back to Lowell !