Ice Thickness Guide
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 tons
*Solid clear blue/black and lake ice.
Slush ice has only half the strength of blue ice.
Strength value of river ice is 15 percent less.
An ice road may be opened when ice thickness is at least 22 cm (8.7 in) along the entire route.
- Weight limit depending on conditions, mostly 2 t (2.0 long tons; 2.2 short tons) to 2.5 t (2.5 long tons; 2.8 short tons)
- Vehicles travelling in the same direction must be at least 250 m (820 ft) apart.
- Recommended travelling speeds are under 25 km/h (16 mph) or between 40–70 km/h (25–43 mph). It is advised to avoid the range of 25 and 40 km/h (16 and 25 mph) due to danger of creating resonance in the ice layer (i.e. vehicle speed and water wave speed being the same or nearly, resulting in a large wave under the ice that breaks the ice).
- Seat belts must not be fastened due to danger of drowning if the ice breaks.
- The vehicle must not be stopped.
- Vehicles are allowed to enter the ice road in three minute intervals.
- Ice roads may only be used in daylight.