A trail is usually a path, track or unpaved lane or road. In the United Kingdom and the Republic of Ireland, path or footpath is the preferred term for a walking trail. The term is also applied, in North America, to routes along rivers, and sometimes to highways. In the US, the term was historically used for a route into or through wild territory used by emigrants (e.g. the Oregon Trail). In the USA "trace" is a synonym for trail, as in Natchez Trace. Some trails are single use and can only be used for walking, cycling, horse riding, snowshoeing, and cross-country skiing; others, as in the case of a bridleway in the UK, are multi-use, and can be used by walkers, cyclists and equestrians. There are also unpaved trails used by dirt bikes and other off-road vehicles and in some places, like the Alps, trails are used for moving cattle and other livestock.
In New Zealand, the terms track or walkway are used almost exclusively except in reference to cross-country skiing: "walkways vary enormously in nature, from short urban strolls, to moderate coastal locations, to challenging tramps [hikes] in the high country [mountains]". Walkway is used similarly in St. John's, Newfoundland, Canada, where the "Grand Concourse", is an integrated walkway system.
In the United Kingdom, the term trail is in common usage. Longer distance walking routes, and government-promoted long distance paths, collectively known as National Trails, are also frequently called ways; as in the Pennine Way and South Downs Way. Generally the term footpath is preferred for pedestrian routes, including long distance trails, and is also used for urban paths and sometimes in place of pavement. Track is used for wider paths (wide enough for vehicles), often used for hiking. The terms bridleway, byway, restricted byway are all recognised legal terms and to a greater or lesser extent in general usage.
In the early years of the 20th century, the term auto trail was used for a marked highway route, and trail is now also used to designate routes, including highway routes, designated for tourist interest like the Cabot Trail, Nova Scotia, Canada and the Quilt Trails in the US. The term trail has also been used by developers and urban planners for a variety of modern paved roads, highways, and boulevards, in these countries, and some highways continue to be officially called a trail, such as the Susquehanna Trail in Pennsylvania, a designation that varies from a two-lane road to a four-lane freeway. A particularly unusual use of the term is in the Canadian province of Alberta, which has multi-lane freeways called trails.
The first trails were created by animals, and these were "later adapted by humans." Many historic routes, such as the Silk Road, the Amber Road, and the Royal Road of the Persian Empire, existed before the Christian era and covered great distances.
The idea of following a path or track for exercise or pleasure only really developed during the 18th century in Europe, and arose because of changing attitudes to the landscape and nature associated with the Romantic movement. In earlier times walking generally indicated poverty and was also associated with vagrancy.: In previous centuries long walks were undertaken as part of religious pilgrimages and this tradition continues throughout the world.
Trails can be located in different settings for various uses. These can include:
- Disability and wheelchair accessible paths in sensory gardens and all the above settings.
- Gardens and designed landscapes: in private gardens and in public areas; and at park visitors centers as natural history interpretive nature trails in designed wildlife gardens.
- A type of trail that was quite popular in the 1970s and 1980s but is less popular today is the exercise trail (also known as trim trail), which combines running with exercise stations.
- Jogging or running paths. Many runners also favor running on trails rather than pavement, as giving a more vigorous work-out and better developing agility skills, as well as providing a more pleasant exercise environment.
- Parks: including public spaces, urban parks, neighborhood parks, linear parks, botanic gardens, arboretum, and regional parks.
- Sculpture gardens and open-air museums, as sculpture trails and historic interpretive trails.
- Educational and Themed trail
Trail segregation, the practice of designating certain trails as having a specific preferred or exclusive use, is increasingly common and diverse. For example, bike trails are used not only on roads open to motor vehicles, but also in trail systems open to other trail users. Some trails are segregated for use by both equestrians and mountain bikes, or by equestrians only, or by mountain bikes only. Designated "wilderness area" trails may be segregated for non-wheeled use (hence permit backpacking and horses but exclude mountain bikes and motorized vehicles).
Often, trail segregation for a particular use is accompanied by prohibitions against that use on other trails within the trail system. Trail segregation may be supported by signage, markings, trail design and construction (especially selection of tread materials), and by separation between parallel treads. Separation may be achieved by "natural" barriers including distance, ditching, banking, grading, and vegetation, and by "artificial" barriers including fencing, curbing, and walls.
The number of off-road cycle trails has increased significantly, along with the popularity of mountain bikes. Off-road bicycle trails are generally function-specific and most commonly waymarked along their route. They may take the form of single routes or form part of larger complexes, known as trail centres. Off-road trails often incorporate a mix of challenging terrain, singletrack, smooth fireroads, and even paved paths. Trails with an easy or moderate technical complexity are generally deemed cross-country trails, while trails difficult even to experienced riders are more often dubbed all-mountain, freeride, or downhill. Downhilling is particularly popular at ski resorts such as Mammoth Mountain in California or Whistler Blackcomb in British Columbia, where ski lifts are used to get bikes and riders to the top of the mountain.
EuroVelo bicycle routes are a network of (currently 14) long-distance cycling routes criss-crossing Europe in various stages of completion, more than 45,000 km (27,962 mi) was in place by 2013. It is envisaged that the network will be substantially complete by 2020 and when finished, the EuroVelo network's total length will exceed 70,000 km (43,496 mi). EuroVelo is a project of the European Cyclists' Federation (ECF).
EuroVelo routes can be used for bicycle touring across the continent, as well as by local people making short journeys. The routes are made of both existing national bike routes, such as the Dutch LF-Routes, the German D-Routes, and the British National Cycle Network, and existing general purpose roads, together with new stretches of cycle routes to connect them.
Off-road cycling can cause soil erosion and habitat destruction if not carried out on established trails. This is particularly so when trails are wet, overall though, cycling may have only as much impact as other trail users 
Cross-country skiing trail
In cross-country skiing a trail is also called a track or piste. Recreational cross-country skiing is also called touring, especially in Europe. Some skiers stay out for extended periods using tents and equipment similar to bushwalkers and hikers, whereas others take relatively short trips from ski resorts on maintained trails. In some countries, organizations maintain a network of huts for use by cross-country skiers in wintertime. For example, the Norwegian Mountain Touring Association maintains over 400 huts stretching across hundreds of kilometres of trails which are used by hikers in the summer and by skiers in the winter.
Horse riding and other equestrian uses of trails continue to be a popular activity for many trail users. Horses can usually negotiate much the same grades as hikers, but not always, although they can more easily clear obstacles in the path such as logs.
The Bicentennial National Trail (BNT) in Australia is one of the longest marked multi-use trail in the world, stretching 5,330 km (3,312 mi) from Cooktown, Queensland, through New South Wales to Healesville, Victoria. This trail runs the length of the rugged Great Dividing Range through national parks, private property and alongside of wilderness areas. One of the objectives was to develop a trail that linked up the brumby tracks, mustering and stock routes along the Great Dividing Range, thus providing an opportunity to legally ride the routes of stockmen and drovers who once travelled these areas with pack horses. This Trail provides access to some of the wildest, most remote country in the world. The Bicentennial National Trail is suitable for self-reliant horse riders, fit walkers and mountain bike riders.
Within the United States National Trail Classification System, equestrian trails include simple day-use bridle paths and others built to accommodate long strings of pack animals on journeys lasting many days. Trail design parameters for these uses include trail base width and material, trail clear width, trail clear height, access to water suitable for stock (not human) use, and trail routing.
A footpath is a type of thoroughfare that is intended for use only by pedestrians, not other forms of traffic such as motorized vehicles and horses. They can be paths within an urban area, or rural paths through the countryside. Urban footpaths are usually paved, may have steps, are called alleys, lanes, steps, etc., and may be named. Other public rights of way, such as bridleways, byways, towpaths, and green lanes are also used by pedestrians.
In some regions of the United Kingdom, such as England and Wales, there are rights of way on which pedestrians have a legally protected right to travel. National parks, nature preserves, conservation areas and other protected wilderness areas may have trails that are restricted to pedestrians.
In the US and Canada, where urban sprawl has begun to strike even the most rural communities, developers and local leaders are currently striving to make their communities more conducive to non-motorized transportation through the use of less traditional trails. The Robert Wood Johnson Foundation has established the Active Living by Design program to improve the livability of communities in part through developing trails, The Upper Valley Trails Alliance has done similar work on traditional trails, while the Somerville Community Path and related paths, are examples of urban initiatives. In St. John's, Newfoundland, Canada the "Grand Concourse", is an integrated walkway system that has over 160 kilometers (99 mi) of walkways, which link every major park, river, pond, and green space in six municipalities.
Motorized trail use also remains very popular with some people. Such terms as ORV, four-wheeling, all-terrain vehicle, and others actually have highly specific meanings. In the United States, this sport remains very popular. The Recreational Trails Program defined as part of the Intermodal Surface Transportation Efficiency Act of 1991 mandates that states must use a minimum of 30 percent of these funds for motorized trail uses.
Off-road vehicle use on public land has been criticized by some members of the US government and environmental organizations including the Sierra Club and The Wilderness Society. They have noted several consequences of illegal ORV use such as pollution, trail damage, erosion, land degradation, possible species extinction, and habitat destruction which can leave hiking trails impassable. ORV proponents argue that legal use taking place under planned access along with the multiple environment and trail conservation efforts by ORV groups will mitigate these issues. Groups such as the Blueribbon Coalition advocate Treadlightly, which is the responsible use of public lands used for off-road activities.
Noise pollution is also a concern, and several studies conducted by Montana State University, California State University, University of Florida and others have cited possible negative behavioral changes in wildlife as the result of some ORV use. Some US states have laws to reduce noise generated by off-road and non-highway vehicles. Washington is one example.
Water trails, also referred to as blueways or paddling trails, are marked routes on navigable waterways such as rivers, lakes, canals and coastlines for people using small non-motorized boats such as kayaks, canoes, rafts, or rowboats. Some trails may be suitable for float tubing or developed in concert with motorized use. They include: signs and route markers; maps; facilities for parking, boat ramps or docks, and places to camp and picnic. There are also state programs and other promotion for water trails. The American Canoe Association has compiled a database of water trails in the United States. The National Park Service Rivers, Trails, and Conservation Assistance Program has compiled a list of water trail resources, success stories, and statewide contacts for water trails.
Shared use may be achieved by sharing a trail easement, but within it maintaining segregated and sometimes also separated trail treads. This is common in rail trails. Shared use may also refer to alternate day arrangements, whereby two uses are segregated by being permitted on alternate days. This is increasingly common in long-distance trails shared by equestrians and mountain bike users; these two user communities have similar trail requirements but may experience encounters with each other on the trail as difficult
In the United States, the East Coast Greenway (3,000 mi (4,828 km) from Key West to the Canadian border) and the September 11th National Memorial Trail (a 1,300 mi (2,092 km) triangular loop connected the three 9/11 memorial sites)are two long-distance multi-use paths for cyclists, runners, walkers, even equestrians.
In Belgium RAVeL, French for réseau autonome de voies lentes (autonomous network of slow ways), is a Walloon initiative aimed at creating a network of itineraries reserved for pedestrians, cyclists, horse riders and people with reduced mobility. The network makes use of towpaths on river banks and disused railway or vicinal tramway lines. Old railway lines have been leased by the Walloon Government for 99 years using emphyteutic lease contracts. Where necessary, new paths are created to link parts of the network.
In England and Wales a bridleway is a trail intended for use by equestrians, but walkers also have a right of way, and Section 30 of the Countryside Act 1968 permits the riding of bicycles on public bridleways, though the act says that it "shall not create any obligation to facilitate the use of the bridleway by cyclists". Thus the right to cycle exists even though it may be difficult to exercise on occasion, especially in winter. Cyclists using a bridleway are obliged to give way to other users on foot or horseback.
The seawall in Stanley Park, Vancouver, British Columbia, Canada is popular for walking, running, cycling, and inline skating. There are two paths, one for skaters and cyclists and the other for pedestrians. The lane for cyclists and skaters goes one-way in a counterclockwise loop.
There is open access to most Forestry Commission roads and land in Great Britain for walkers, cyclists and horse riders and, since the Countryside Bill of 1968, it has become the largest provider of outdoor recreation in Britain. The Commission works with associations involved in rambling, cycling, mountain biking and horse riding to promote the use of its land for recreation. The trails open to the public are not just forest roads and a notable example of the Commissions promotion of outdoor activity is the 7stanes project in Scotland, where seven purpose built areas of mountain bike trails have been laid, including facilities for disabled cyclists.
A Holloway (also hollow way) is a sunken path or lane, i.e., a road or track that is significantly lower than the land on either side, not formed by the (recent) engineering of a road cutting but possibly of much greater age. Various mechanisms have been proposed for how holloways may have been formed, including erosion by water or traffic; the digging of embankments to assist with the herding of livestock; and the digging of double banks to mark the boundaries of estates. These mechanisms are all possible and could apply in different cases.
Rail trails or paths are shared-use paths that make use of abandoned railway corridors. They can be used for walking, cycling and horse riding. They exist throughout the world and the following is a description of trails in Australia:
- Following the route of the railways, they cut through hills, under roads, over embankments and across gullies and creeks. Apart from being great places to walk, cycle or horse ride, rail trails are linear conservation corridors protecting native plants and animals. They often link remnant vegetation in farming areas and contain valuable flora and fauna habitat. Wineries and other attractions are near many trails as well as B&B's and other great places to stay.
Most trails have a gravel or dirt surface suitable for walking, mountain bikes and horses. In the USA the 27 mile/43 km long Cheshire Rail Trail, in New Hampshire, can be used by hikers, horseback riders, snowmobilers, cross-country skiers, cyclists, or even a dogsledders. In Canada, following the abandonment of the Prince Edward Island Railway in 1989, the government of Prince Edward Island purchased the right-of-way to the entire railway system. The Confederation Trail was developed as a tip-to-tip walking/cycling gravel rail trail which doubles as a monitored and groomed snowmobile trail during the winter months, operated by the PEI Snowmobile Association. A considerable part of the Trans Canada trail are repurposed defunct rail lines donated to provincial governments by CP and CN rail rebuilt as walking trails. As such, much of the Trans Canada Trail development emulated the successful Rails-to-Trails initiative in the United States, The Trail is multi-use and depending on the section may allow hikers, bicyclists, horseback riders, cross country skiers and snowmobilers.
A towpath is a road or path on the bank of a river, canal, or other inland waterway. The original purpose of a towpath was to allow a horse, or a team of human pullers to tow a boat, often a barge. They can be paved or unpaved and are popular with cyclists and walkers, and some are suitable for equestrians. In Scotland equestrians have legal access to all towpaths, and there is a campaign for similar rights in England and Wales. In snowy winters in the USA they are popular with cross-country skiers and snowmobile users.
In Britain, most canals were owned by private companies, and the towpaths were deemed to be private, for the benefit of legitimate users of the canal. The nationalisation of the canal system in 1948 did not result in the towpaths becoming public rights of way, and subsequent legislation, such as the Transport Act of 1968, which defined the government's obligations to the maintenance of the inland waterways for which it was now responsible, did not include any commitment to maintain towpaths for use by anyone. However, some ten years later British Waterways started to relax the rule that a permit was required to give access to a towpath, and began to encourage leisure usage by walkers, anglers and in some areas, cyclists. The British Waterways Act of 1995 still did not enshrine any right of public access, although it did encourage recreational access of all kinds to the network, although the steady development of the leisure use of the canals and the decline of commercial traffic had resulted in a general acceptance that towpaths are open to everyone, and not just boat users. The concept of free access to towpaths is enshrined in the legislation which transferred responsibility for the English and Welsh canals from British Waterways to the Canal & River Trust in 2012.
Not all towpaths are suitable for use by cyclists, but where they are, and the canal is owned by British Waterways, a permit is required. There is no charge for a permit, but it acts as an opportunity to inform cyclists about safe and unsafe areas to cycle. Some areas including London are exempt from this policy, but are covered instead by the London Towpath Code of Conduct and cyclists are required to have a bell, which is rung twice when approaching pedestrians. Parts of some towpaths have been incorporated into the National Cycle Network, and in most cases this has resulted in the surface being improved.
In France it is possible to cycle, rollerblade, and hike along the banks of the Canal du Midi. A paved stretch of 50 km (30 miles) from Toulouse to Avignonet-Lauragais and another 12 km (7 miles) between Béziers and Portiragnes are particularly suited to cycling and rollerblading. It is possible to cycle or walk the entire Canal des Deux Mers from Sète to Bordeaux. Other French canals provide walkers "with many excellent routes, as they are always accompanied by a towpath, which makes a pleasant off-road track, and have the added virtues of flatness, shade and an abundance of villages along the way", though walking a canal can be monotonous, so that "a long trip beside a canal is better done by bicycle".
An urban trail is a citywide network of non-motorized, multi-use pathways that are utilized by bicyclists, walkers and runners for both transportation and recreation. Urban trails average ten foot in width and are surfaced with asphalt or concrete. Some are striped likes roads to designate two-way traffic. Urban trails are designed with connections to neighborhoods, businesses, places of employment and public transport stops.
Urban pedestrian footpaths are sometimes called alleys or lanes and in older cities and towns in Europe and are often what is left of a medieval street network or right-of-ways or ancient footpaths. Similar paths also exist in some of the older North American towns and cities, like Charleston, South Carolina, New Castle, Delaware, and Pittsburgh, Pennsylvania. Such urban trails or footpaths are narrow, usually paved and often between the walls of buildings. This type is usually short and straight, and on steep ground can consist partially or entirely of steps. Some are named. Because of geography steps are a common form of footpath in hilly cities and towns. This includes Pittsburgh (see Steps of Pittsburgh), Cincinnati (see Steps of Cincinnati), Seattle, and San Francisco in the United States, as well as Hong Kong, Quebec City, Quebec, Canada, and Rome. Stairway trails are found in a number of hilly American cities. This includes the Stairway Trails in Bernal Heights, East San Francisco.
Trail system layout
A linear trail goes from one point to another without connecting trails. These trails are also known as "out-and-back" or "destination" trails. Rail trails and long-distance trails are examples of linear trails. Linear trails usually follow long distances. A shorter linear trail is a spur trail, which takes a user to a particular point-of-interest, such as a waterfall or mountain summit.
A looped trail allows a user to end up where they started with either minimal or no repeating parts of the trail. Looped-trail systems come in many permutations. A single-looped trail system is often used around lakes, wetlands, and other geological features. A series of looped trails is a stacked-loop trail system. A stacked loop trail system has several, interconnected looped trails. This creates an efficient, compact design with many route options. In a multiple-loop system, each loop extends from a single trailhead.
Trail systems often combine linear trails with looped trails. In a spoked-wheel system, linear trails connect a central trailhead with an outer loop. In a primary-and-secondary loop system, a linear trails connect a primary loop with secondary loops. Last, a maze system incorporates both loops and linear trails. Maze systems provide users many choices; however, some users may find navigation difficult.
An important network of long distance paths in Europe the Via Alpina was created by a group of public and private organisations from the eight Alpine countries in 2000, receiving EU funding from 2001 until 2008. It was initiated by the Association Grande Traversée des Alpes in Grenoble, which hosted the Via Alpina international secretariat until January 2014, when it was transferred to the International Commission for the Protection of the Alps CIPRA, in Liechtenstein. There are national secretariats (hosted by public administrations or hiking associations) in each country. Its aim is to support sustainable development in remote mountain areas and promote the Alpine cultures and cultural exchanges. 
The Grande Randonnée (French), Grote Routepaden or Lange-afstand-wandelpaden (Dutch), Grande Rota (Portuguese) or Gran Recorrido (Spanish) is a network of long-distance footpaths in Europe, mostly in France, Belgium, the Netherlands and Spain. Many GR routes make up part of the longer European walking routes which cross several countries. In France alone, the trails cover approximately 60,000 kilometres (37,000 mi). In France, the network is maintained by the Fédération Française de la Randonnée Pédestre (French Hiking Federation), and in Spain by the Spanish Mountain Sports Federation.
UK and Ireland
In England and Wales many trails and footpaths are of ancient origin and are protected under law as rights of way. In the Republic of Ireland, the Keep Ireland Open organization is campaigning for similar rights. Local highways authorities, in England and Wales, (usually county councils or unitary authorities) are required to maintain the definitive map of all public rights of way in their areas and these can be inspected at council offices. If a path is shown on the definitive map and no subsequent order (e.g. a stopping up) exists then the right of way is conclusive in law. But just because a path is not on that map does not mean that it is not a public path, as the rights may not have been recorded. The Countryside Agency estimated that over 10% of public paths were not yet listed on the definitive map. The Countryside and Rights of Way Act 2000 provides that paths that are not recorded on the definitive map by 2026 and that were in use prior to 1949 will automatically be deemed stopped-up on 1 January 2026.
In Scotland, a right of way is a route over which the public has been able to pass unhindered for at least 20 years. The route must link two "public places", such as villages, churches or roads. Unlike in England and Wales there is no obligation on Scottish local authorities to signpost or mark a right of way. However the charity Scotways, formed in 1845 to protect rights of way, records and signs the routes. There is no legal distinction between footpaths and bridleways in Scotland, as there is in England and Wales, though it is generally accepted that cyclists and horseriders may follow rights of way with suitable surfaces.
The Land Reform (Scotland) Act 2003 established a general presumption of access to all land in Scotland, making the existence of rights of way less important in terms of access to land in Scotland. Certain categories of land are excluded from this presumption of open access such as railway land, airfields and private gardens..
Northern Ireland has very few public rights of way and access to land in Northern Ireland is more restricted than other parts of the UK, so that in many areas walkers can only enjoy the countryside because of the goodwill and tolerance of landowners. Northern Ireland shares the same legal system as England, including concepts about the ownership of land and public rights of way, but it has its own court structure, system of precedents and specific access legislation.
In England and Wales a National Trails system also exists of long distance footpaths, which are administered by Natural England and the Natural Resources Wales, statutory agencies of the UK government and the Welsh Government respectively. These include Hadrian's Wall Path, the Pembrokeshire Coast Path, the Pennine Bridleway (bridleway), the South West Coast Path (South West Way) (the longest), and the Thames Path, and many more. Together these are over 4,000 kilometres (2,500 mi) long.
In Scotland, the equivalent trails are called Scotland's Great Trails and are administered by NatureScot. The first, and probably the most popular, is the West Highland Way, which is 95 miles (153 km) long and was opened in 1980.
Sustrans is a British charity that promotes sustainable transport, and it works on projects to encourage people to walk, cycle, and use public transport, so as to give people the choice of "travelling in ways that benefit their health and the environment". Sustrans' flagship project is the National Cycle Network, which has created over 14,000 milesof signed cycle routes throughout the UK.
In 1968, the United States its National Trails System, which includes National Scenic Trails, National Historic Trails and National Recreation Trails, was created by the National Trails System Act. The most famous American long trails are The Appalachian National Scenic Trail, generally known as the Appalachian Trail and the Pacific Crest Trail. The Appalachian Trail is a marked hiking route in the eastern United States extending between Springer Mountain, Georgia and Mount Katahdin, Maine. The trail is approximately 2,200 miles (3,500 km) long. The Pacific Crest Trail is a long-distance hiking and equestrian trail closely aligned with the highest portion of the Sierra Nevada and Cascade mountain ranges, which lie 100 to 150 miles (160 to 240 km) east of the US Pacific coast. The trail's southern terminus is on the US border with Mexico, and its northern terminus on the US–Canada border on the edge of Manning Park in British Columbia, Canada; its corridor through the US is in the states of California, Oregon, and Washington. It is 2,663 mi (4,286 km) long.
The rules and regulations for a trail are written and enforced by the land management agency in charge of the trail. A trail may be completely contained within one administration (e.g. a State Park) or it may pass through multiple administrations, leading to a confusing array of regulations, allowing dogs or mountain bikes in one segment but not in another, or requiring Wilderness Permits for a portion of the trail, but not everywhere.
In the United States agencies administering trails include the National Park Service, the US Forest Service, the Bureau of Land Management, State Park systems, County Parks, cities, private organizations such as land trusts, businesses and individual property owners.
New trail construction by an agency must often be assessed for its environmental impact and conformance with State or Federal laws. For example, in California new trails must undergo reviews specified by the California Environmental Quality Act (CEQA).
All trails and shared use paths—indeed, any areas open to pedestrians—that are owned or operated by a public or private entity covered by the Americans with Disabilities Act are subject to federal regulations on Other Power-Driven Mobility Devices (“OPDMDs”). These rules potentially greatly expand the types of vehicular devices that must be permitted on trails, shared use paths, other routes, and other areas open to the public. This publication discusses ways to manage access by these vehicles.
There are many types of non-motorized, land-based recreational trails and shared use paths: hiker and pedestrian trails, mountain biking trails, equestrian trails, and multi-use trails designed for several user types. The companion guide to this publication, the 2013 Pennsylvania Trail Design and Development Principles: Guidelines for Sustainable, Non-Motorized Trails (the “Pennsylvania Trail Design Manual”), provides a great deal of guidance and detailed information about the characteristics of the various types of trails and paths. Readers should use that publication as a primary resource to help evaluate which specific type of route they want to plan, design, construct, and manage for their site. The publication Universal Access Trails and Shared Use Paths: Design, Management, Ethical and Legal Considerations focuses on the accessibility aspects of the most commonly constructed types.
The companion guide to this publication, the 2013 Pennsylvania Trail Design and Development Principles: Guidelines for Sustainable, Non-Motorized Trails (the “Pennsylvania Trail Design Manual”), provides a great deal of guidance and detailed information about the characteristics of the various types of trails and paths. Readers should use that publication as a primary resource to help evaluate which specific type of route they want to plan, design, construct, and manage for their site. This publication focuses on the accessibility aspects of the most commonly constructed types.
While most trails have arisen through common usage, the design and construction of good quality new paths is a complex process that requires certain skills.
When a trail passes across a flat area that is not wet, brush, tree limbs and undergrowth are removed to create a clear, walkable trail. A bridge is built when a stream or river is sufficiently deep to make it necessary. Other options are culverts, stepping stones, and shallow fords. For equestrian use, shallow fords may be preferred. In wet areas an elevated trailway with fill or a boardwalk is often used, though boardwalks require frequent maintenance and replacement, because boards in poor condition can become slippery and hazardous.
Trail gradient are determined based on a site specific assessment of soils and geology, drainage patterns of the slope, surrounding vegetation types, position on the slope of a given trail segment (bottom, mid-slope, ridgeline), average precipitation, storm intensities, types of use, volume and intensity of use, and a host of other factors affecting the ability of the trail substrate to resist erosion and provide a navigable surface. Trails that ascend steep slopes may use switchbacks, but switchback design and construction is a specialized topic.
Trails accessible to off-road wheelchairs, have a grade no more than one in ten. Paved trails that are accessible to all wheelchairs, have a grade of be no more than one in twelve, with periodic level pull-offs.
On a well constructed trail the slope of the trail from side to side is never more than one in twelve, because side-sloped trails are prone to gullying. The ideal path is built almost, but not quite, level in cross-section.
To achieve a proper slope in hilly terrain a sidehill trail is excavated. This type of trailway is created with the establishing a line of suitable slope across a hillside, which is then dug out by means of a mattock or similar tool. This may be a full-bench trail, where the treadway is only on the firm ground surface after the overlying soil is removed and sidecast (thrown to the side as waste), or a half-bench trail, where soil is removed and packed to the side so that the treadway is half on firm old ground and half on new packed fill. In areas near drainages, creeks and other waterways, excavation spoils are taken away in bulk and deposited in an environmentally benign area. In problem areas trails are established entirely on fill. In such cases the soil is packed down firmly and the site is periodically checked to maintain the stability of the trail.
Cycle trails built for commuting may be built to a different set of standards than pedestrian-only trails and, in some cases, may require a harder surface, fewer changes in grade and slope, increased sight visibility, and fewer sharp changes in direction. On the other hand, the cross-slope of a bicycle trail may be significantly greater than a foot trail, and the path may be narrower in some cases. The American Association of State Highway and Transportation Officials recommends different widths for different types of bicycle facilities. For example, a shared use path has a recommended one directional width of 8 feet (2.44 m), while a bidirectional path should be significantly wider (10 to 12 feet or 3.05 to 3.66 metres) to accommodate bidirectional traffic and users. The US Department of Transportation provides additional guidance on recreational bicycle and pedestrian trail planning and design standards.
Trail construction requires proper drainage. If trails have inadequate drainage, three issues may occur: First, water may accumulate on flat terrain to the point that the trail becomes unusable. Second, moving water can erode trails on slopes. Third, inadequate drainage may create local mud spots. Mountain bike trails slope out or across the trail 3-5% downhill to encourage water to run off the side, rather than down the trail bed.
To remedy the first problem, water accumulation on flat terrain, raised walkways are often built. Raised walkways include turnpikes, causeways, embankments, stepping stones, and bridges (or deckwalks). The earthen approaches are often done by cutting poles from the woods, staking parallel poles in place on the ground, then filling between them with whatever material is available to create the raised walkway. The more elaborate option of the deckwalk is by necessity reserved for shorter stretches in very high-traffic areas. Water accumulation is particularly common in the North Country of England.
The second problem, water erosion, is caused because trails, by their nature, tend to become drainage channels and eventually gullies when the drainage is poorly controlled. Where a trail is near the top of a hill or ridge, this is usually a minor issue, but when it is farther down it can become a very major issue.
In areas of heavy water flow along a trail, a ditch is often dug on the uphill side of the trail with drainage points across the trail. The cross-drainage is also accomplished by means of culverts, which are cleared on a semi-annual basis, or by means of cross-channels, often created by placing logs or timbers across the trail in a downhill direction, called "thank-you-marms", "deadmen", or waterbars. Timbers or rocks are also used for this purpose to creates erosion barriers. Rock paving in the bottom of these channels and in the trailside ditches are also sometimes used o maintain stability. The creation of water bars, with or without ditching, at major points of water flow on or along the trail, and in conjunction with existing drainage channels below the trail is also a technique that is applied. Another technique that has been adopted is the construction coweeta dips, or drain dips, points on the trail where it falls briefly (for a meter or so) and then rises again. These provide positive drainage points that are almost never clogged by debris.
The third type of problem can occur both on bottomlands and on ridgetops and a variety of other spots. A local spot or short stretch of the trail may be chronically wet. If the trail is not directly on rock, then a mud pit forms. Trail users go to the side of the trail to avoid the mud pit, and the trail becomes widened. A "corduroy" is a technique that is used when this area cannot be drained. This ranges from random sticks to split logs being laid across the path. Some of the early turnpikes in the United States were log corduroys, and these can still be found in third-world forested areas. With recreational trails, it is common the sticks that may be one to three inches thick and laid in place, close together. Sometimes, a short bridge is used.
Natural surface, single-track trails will require some ongoing maintenance. However, if the trail is properly designed and constructed, maintenance should be limited to clearing downed trees, trimming back brush and clearing drainages. Depending on location, if the trail is properly designed, there should be no need for major rework such as grading or erosion control efforts. However, mountain trails which see both significant rainfall and human traffic may require "trail hardening" efforts in order to prevent further erosion. Most of the seemingly natural rock steps on the mountain trails of the northeast United States are, in fact, the work of professional and volunteer trail crews.
For long-distance trails, or trails where there is any possibility of anyone taking a wrong turn, blazing or signage is provided (the term waymarking is used in Britain). This is accomplished by using either paint on natural surfaces or by placing pre-made medallions or sometimes cairns. Horseshoe-shaped blazes are frequently used for bridle trails. The Appalachian Trail is blazed with white rectangles, and blue is often used for side trails. European long distance walking paths are blazed with yellow points encircled with red. However, other walking paths in European countries are blazed in a variety of manners.
Where bike trails intersect with pedestrian or equestrian trails, signage at the intersections and high visibility onto the intersecting trails are needed in order to prevent collisions between fast-moving cyclists and slower moving hikers and horses. Bicycles and horses can share the same trails where the trail is wide enough with good visibility. The US Department of Transportation provides standards and guidelines for traffic control, including signage and striping, for bicycle facilities.
- Green circle - easy
- Blue square - moderate
- Black diamond - difficult
In Switzerland, paths are classified by three levels of difficulties: Hiking paths (yellow markers), mountain paths (white-red-white markers) and alpine paths (white-blue-white markers).
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