Following the premier of NHDOT's I-93 Twitter feed back in February, NHDOT has expanded their Twitter Traffic Alerts To I-89 And I-95, with Twitter feeds for the Everett And Spaulding Turnpikes to be added on May 15th.
Here is the handy dandy press release which contains related Twitter links...
http://www.nh.gov/dot/media/nr2010/nr050410twitter.htm (http://www.nh.gov/dot/media/nr2010/nr050410twitter.htm)