There are an estimated of roads and highways across the Canadian territory of Nunavut, which is the only province/territory not connected by road to other parts of Canada. Most vehicles in the territory are moved from community to community and in and out of the territory by large barges that move during the summer shipping season. Less commonly, vehicles may be flown in on a cargo plane. Car companies will usually fly vehicles in to test them in Arctic conditions. The few highways that exist in Nunavut are not numbered. Street signs are in English, Inuktitut and Inuinnaqtun depending on locations. Compared to the rest of Canada, maintaining a vehicle in Nunavut is expensive. Rough roads and harsh weather result in expensive upkeep for vehicles, and despite being subsidised by the government, gas prices are among the highest in Canada. Parts can take an extremely long time to ship in and are very expensive. Mechanics also charge a premium, since very few do business in the territory. Due to the lack of a cohesive road network, aircraft are still the preferred way to travel, especially between communities, along with ATVs through most of the year, snowmobiles in winter, and boats during the summer. Travel by dog sled has largely disappeared, although recreational dog-sledding is still common. About 4,000 vehicles are registered in the territory. Many makes and models of vehicles can be found in the territory, but the most common are heavy-duty four-wheel-drive vehicles such as sport utility, jeeps and full-size vans. A wide range of vehicles can be found in Iqaluit, where the government tends to do most of its business and the road system consists of paved and chip-sealed portions, although it too is primarily dirt. Despite Nunavut's isolation from the rest of Canada's road network, provincial licence plates can be found from Newfoundland and Labrador, Quebec, and Northwest Territories, as well as government plates from the Department of National Defence; vehicles of all provincial plates can sometimes be found in the territory. Nunavut, at one time was like the Northwest Territories, in that it was one of the few jurisdictions in the world where non-rectangular licence plates could be found, as these two territories issued plates in the shape of a polar bear; Nunavut no longer issues these. Vehicles can display their old provincial plates for 90 days before they must be registered in the territory. A