Numerous paved multi-use trails, mostly operated by the National Capital Commission, wind their way through much of the city, including along the Ottawa River, Rideau River, and Rideau Canal. These pathways are used for transportation, tourism, and recreation. Because many streets either have wide curb lanes or bicycle lanes, cycling is a popular mode of transportation throughout the year. As of 31 December 2015,  of cycling facilities are found in Ottawa, including  of multi-use pathways,  of cycle tracks,  of on-road bicycle lanes, and  of paved shoulders.  of new cycling facilities were added between 2011 and 2014. A downtown street that is restricted to pedestrians only, Sparks Street was turned into a pedestrian mall in 1966. On Sundays (since 1960) and selected holidays and events, additional avenues and streets are reserved for pedestrian and/or bicycle use only. In May 2011, the NCC introduced the Capital Bixi bicycle-sharing system.