Depends on the highway, or what passes for highways in New Hampshire. I worked in Concord for 8 years and at least twice a winter every year got trapped near the Epsom traffic circle for 45-75 minutes due to poor plowing making traffic grind to a complete halt. People would ask why I didn't stay home, and it was always the case that roads were fine until I hit Epsom.

And these weren't blizzard days, because the university closed then, just typical, a few inches of snow storms.