I-70 east and west of the tunnel. Just go slowly and don’t try to be speedy. Winter driving. Keep to the slow lane and keep plenty of fallowing distance in front of you. There are too many crazies on the road to try to join them in the persuit of speed. Radio Station from Summit County 93.1 is fun for always cheerful music and road conditions. Be Safe in your journey.
And then there is Loveland Pass if the level of difficulty is too easy for you down below.