Been using this on my mobile browser before it became an app. I travel all over the state, about 30K a year and it helps tremendously!
Another app just recent is the 'NH Alerts' app sponsored by NH.gov. It will tell you road conditions and accidents ahead.
http://www.readynh.gov/alerts/index.htm.
Another recent app which I used for my NC trip is 'Waze'. Alerts you of Smoky Bear and cars on the side of the roads.