Cycling in Denmark is both a common and popular recreational and utilitarian activity. Bicycling infrastructure is a dominant feature of both city and countryside infrastructure with segregated dedicated bicycle paths and lanes in many places and the network of 11 Danish National Cycle Routes (along with many regional routes) extends more than nationwide. Often bicycling and bicycle culture in Denmark is compared to the Netherlands as a bicycle-nation. Infrastructure Cycle paths and lanes There are an estimated of segregated dedicated bicycle paths and lanes in Denmark and the four biggest cities alone account for more than with in Aalborg, in Odense, in Aarhus and in Copenhagen. Cycle paths are often raised above the shoulder of the road and separated by a curb, but on older roads it is more common to have a cycle lane separated by a thick white line and sometimes the lane may be marked by coloured asphalt. Massive infrastructure investments are taking place to create more cycle ways and thus increase safety. At intersections, the continuation of the cycle way or lane is often highlighted by a broad blue band to increase its visibility and cyclists may find that they have their own set of traffic lights. In general both paths and lanes are designed for the more slow pace of utility cycling as opposed to more speedy designs in other countries. The Danish Roads Directorate acknowledges that the Danish cycle track system "functions best when cyclists travel at relatively low speeds". In Copenhagen a system of interconnected green cycle routes, "greenways", is under development, with the aim of facilitating fast, safe and pleasant cycle transport across the city. The network will cover more than and consist of 22 routes. As of 2011, there were of greenways in Copenhagen. Danish National Cycle Routes The 11 Danish National Cycle Routes form a network of cycling routes throughout the country. They are important routes enabling bicycle tourism and showing off Denmark's natural beauty as well as its regional towns and villages. Integration with other means of transportation Cycling is integrated into both the national, the regional and the local train services in Denmark. Cycles are permitted on trains to facilitate mixed-mode commuting. This is most visible in the urban and suburban rail network of Metropolitan Copenhagen, the S-trains, where cycles can be transported in specified carriages found at the front and rear of each train. As of 2011