There are also municipal roads which comprise different surfaces. Asphalt concrete pavements comprise almost 9,000 kilometres (5,600 mi), granular pavement almost 5,000 kilometres (3,100 mi), non structural or thin membrane surface TMS are close to 7,000 kilometres (4,300 mi) and finally gravel highways make up over 5,600 kilometres (3,500 mi) through the province. In the northern sector, ice roads which can only be navigated in the winter months comprise another approximately 150 kilometres (93 mi) of travel.[2]