.10” ice is hardly ever a problem. Get to .25 and you begin to have problems with tree limbs into power lines, especially if there’s any wind. At half an inch you get lots of tree damage and power lines begin to get stressed mechanically. Put some wind in the mix and you can get galloping conductors on lines with long spans. Bad, bad situation.
Spent 35 years in the electric utility industry in the Midwest. Ice storms were the worst. I sympathize with those guys that have to deal with hurricanes.
As far as infrastructure, power grid, and trees, 1/10 of an inch isn’t too bad, but you cannot drive on it any more than that 1/2 inch.
Thanks for doing a thankless job. So many jobs like that are taken for granted. There are those of us who appreciate those poor guys who have to go out on weekends, and holidays at night, in the worst kinds of weather. They don’t get paid enough, IMO.