Below is what Army Corp of Engineers says about ice thickness and safe load...
Required Minimum Ice Thickness in inches / Description of Safe Moving Load
1-3/4 One person on skies
2 One person on foot or skates
3 One snowmobile
3 A group of people walking single file
7 A single passenger automobile
8 A 2-1/2 ton truck
9 A 3-1/2 ton truck
10 A 7 to 8 ton truck
I cant imagine driving a car on 7" of ice!
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