I ride 14 miles each way, about 10 on bike path. Once the bike path freezes over it stays that way for weeks. It takes 3-4 contiguous days of above freezing temps with sunlight (sunlight is a rare thing in southern Ohio in winter) to melt it.
The M&G 160s worked well on thinner ice say 1/8th inch, but the path gets to be several inches thick in places. What I (and another winter commuter) noticed with them is this: Since there are no studs in the center, while you are going straight and not leaning to one side or the other the tire begins to slip. But as you get off center while slipping, the studs on the side do their job and grab. I will say this is the superior tire for mornings with a heavy frost or a light freezing rain/mist.
Thanks for the input !
This section of the path rarely is without ice once it freezes, but sure is pretty!