Iqaluit has a local road system only stretching from the nearby community of Apex to the Sylvia Grinnell Territorial Park, west of town. Iqaluit has no public transportation, although there is citywide taxi service. Iqaluit Public Transit used to offer bus service in the city, but the service was cancelled due to low ridership. Motor cars are increasing in number, to the extent of causing occasional traffic jams known locally as "the rush minute". However, the cost of shipping automobiles and the wear-and-tear of the harsh Arctic climate combined with its notoriously rough roadways mean that snowmobiles remain the preferred form of personal transportation. All-terrain vehicles are also common in most of the Canadian Arctic. Snowmobiles are used to travel within the city and in the surrounding area. In winter, dog sleds are still used, but primarily for recreation. In winter, the nearby Qaummaarviit Territorial Park and the more remote Katannilik Territorial Park Reserve are only accessible by snowmobile, dog sled or foot. In the summer, both are accessible by boat. Most major roads within Iqaluit are paved with asphalt, but local and smaller roads are gravel. Roads do not have traffic signals, but use stop signs to control intersections.