are often larger in order to be seen better at high speeds, and sometimes affixed markers best communicate who may and may not use a trail besides those on foot. Another possible distinction is by season. In Norway, it is common to use blue for summer routes and red for winter routes. Red routes may traverse lakes and swamps, which are flat and well suited for cross-country skiing in winter, but impassable on foot in summer. Colours are often assigned simply with an eye toward making sure that no two trails that intersect use the same one, but it can go further than that. On all state land in New York's Catskill Park, for instance, primary trails, especially longer "trunk trails" that go great distances, use red markers if they go in a generally east–west direction and blue if they go north–south. Shorter spur, loop or connector trails generally use yellow blazes. On occasions when two trails run concurrently, usually at a slightly staggered junction, only one trail may be signed, often with the longer or more heavily trafficked trail's blaze predominating. In other cases, such as southern Vermont where the Appalachian Trail and the Long Trail follow the same path, both trails may use the same white blaze. A quite different blazing system, called mute blazes was created in the Czech part of the Giant Mountains. The blazes, cut out of sheet metal and painted red, are suspended on high poles, thus being visible to both hikers and skiers. Unlike in classic systems, they do not refer to paths or trails, but show the way to the nearest mountain huts and adjacent towns and villages with the possibility of overnighting and catering. National Trails in England and Wales generally use an acorn symbol. The National Cycle Network in the United Kingdom is signposted using a white bicycle symbol on a blue background, with a white route number in an inset box, but with no destination names or distances. National Route numbers have a red background, Regional Route numbers have a blue background. The system of symbols is based on that used by the Danish National Cycle Route network. The colour used may also indicate the status of the route, for example on rights of way in England and Wales yellow marks are used for footpaths, blue for bridleways, and red for byways open to all traffic. Meaning of trail