Located in the province of Jämtland in modern Jämtland County, the Storsjön is the fifth largest lake in Sweden. In winter a couple of ice roads replace the summer ferry services.
Each year, when the Storsjön (BigLake) freezes over, Sweden's national highway system expands just a little bit and the ferries are replaced by ice roads during the winter, usually January–April. There are 2 ice roads in the lake: Isön-Norderön (1,5km long) and Norderön-Verkön (2,6km long). In summer there is a ferry service as well. There are some rules for this road: weight restriction of 2–4 t (2.0–3.9 long tons; 2.2–4.4 short tons); speed limit of 30 km/h (19 mph); prohibition against stopping or parking on the ice; minimum distance of 50 m (160 ft) between vehicles and restrictions for axle, bogie and gross weight. The thickness of the ice is measured every day to make sure the ice is strong and safe for the cars to travel on. In some places you can save up to 2 hours on your travel time by using the ice road.
Pic: Kenneth E