Trail riding is riding outdoors on trails, bridle paths, and forest roads, but not on roads regularly used by motorised traffic. A trail ride can be of any length, including a long distance, multi-day trip. It originated with horse riding, and in North America, the equestrian form is usually called "trail riding," or, less often "hacking." In the UK and Europe, the practice is usually called horse or pony trekking. The modern term also encompasses mountain biking, mixed terrain cycle-touring, and the use of motorcycles and other motorized all-terrain vehicles. It may be informal activities of an individual or small group, or larger events organized by a club. Some equestrian trail rides in the USA are directed by professional guides or outfitters, particularly at guest ranches, while many equestrians who own horses trail ride on their own in local, state, and national trail systems. In some parts of the world, trail riding (of whatever kind) is limited by law to recognized, and sometimes function-specific, trails that are waymarked. In other places, trails may be less maintained and more natural. Certain trails are limited by trail use types. Trail riding can be combined with other activities, such as camping, hunting, fishing, orienteering and backpacking. Types and uses of trails Often, horses under saddle are subject to the same regulations as pedestrians or hikers where those requirements differ from those for cyclists. In most states, horses are classified as livestock and thus restricted from areas such as the right of way of the interstate highway system, though generally permitted to travel along the side of other roadways, especially in rural areas. Rail trails, which are redeveloped disused railways converted into multi-use trails, often provide invaluable trail riding areas in many parts of the world. A bridle path, also called a bridleway, equestrian trail, horse riding path, bridle road, or horse trail, is a trail or a thoroughfare that is used by people riding on horses, though such trails often now serve a wider range of users, including equestrians, hikers, and cyclists. Such paths are either impassable for motorized vehicles, or vehicles are banned. The laws relating to allowable uses vary from country to country. In England and Wales a bridle path now refers to a route which can be legally used by horse riders in addition to walkers, and since 1968, by cyclists. In the US, the term bridle path is used