http://www.dnr.state.mn.us/safety/ice/thickness.html 7-1/2 inches Passenger car (2-ton gross) 8 inches Light truck (2-1/2-ton gross) 10 inches Medium truck (3-1/2-ton gross) 12 inches Heavy truck (8-ton gross) 15 inches 10 tons 20 inches 25 tons 30 inches 70 tons 36 inches 110…