That's a good example. Honestly, my first taste of how elevation mattered for ice around here, was during the '98 event. I may have said this before, but we tried going skiing during that lol. Nothing was open except Wachusett and I literally almost killed myself there..not a joke.
In any case, on 93 near the Hooksett tolls..you have a little elevation. That's where I saw the ice building up. Down in Concord, there was no ice that I saw, but then getting north of CON and up a bit, all hell started to break loose. After realizing this was not working out, we went to Wachusett which was caked in ice. Not much noticeable until you get near the mtn towards 1K or so.