Sustrans is a UK walking and cycling charity and custodian of the National Cycle Network.
Its flagship project is the National Cycle Network, which has created 12,763 miles (20,540 kilometres) of signed cycle routes throughout the UK including 5,273 mi (8,486 km) of traffic-free paths. The remaining miles of the Network is on previously existing, mostly minor roads, in which motor traffic will be encountered.
Sustrans works with schools to encourage active travel (cycling, walking or scooting) among students. It also works with employers and local authorities. It administers several thousand volunteers who contribute their time to the charity in numerous ways, such as cleaning and maintaining the National Cycle Network, enhancing biodiversity along the routes, leading walks and rides and supporting communities to improve their air quality.