Driving
While easier to drive across in the winter than land, roads over water present a great danger to anyone using them. Speeds are typically limited to 25 km/h (16 mph) to prevent a truck's weight from causing waves under the surface. These waves can damage the road, or dislodge the ice from the shoreline and create a hazard. Another hazard on large lakes is the pressure ridge, a break in the ice created by the expansion and contraction of the surface ice due to variations in temperature.
The roads are normally the domain of large trucks (e.g. tractor-trailer units), although lighter vehicles, such as pickup trucks, are occasionally seen, as are snowmobiles.
Use of ice as the main construction material allows unusual construction techniques: to make a ramp to get the road over a step such as the shore of a lake, for example, lake water is pumped out and mixed with snow to make slush, formed into the shape of the ramp, and allowed to quickly freeze in the intense cold. Worn and damaged roads are repaired by flooding with shallow water that freezes into a new surface layer.
Read more about this topic: Ice Road
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