Network length (transport)

Last updated

In transport terminology, network length (or, less often, system length) refers to the total length of a transport network, and commonly also refers to the length of any fixed infrastructure associated with the network.

Contents

A measurement can be made of the network length of various different modes of transport, including rail, bus, road and air. The measurement may focus on one of a number of specific characteristics, such as route length, line length or track length.

Lines and routes

Continental European and Scandinavian transport network analysts and planners have long had a professional practice of using the following terminology (in their own languages) to draw a distinction between:

In 2000, this terminology was adopted by an English language best practice guide to public transport, to minimise the risk of confusion. [1] [2] Since then, a number of other English language specialist publications have adopted the same terminology, for the same reason. [1] [3] [4] The terminology is therefore also used in this article.

Route length

The route length of a transport network is the sum of the lengths of all routes in the network, [5] such as railways, road sections or air sectors. The U.S. Department of Transportation's Federal Transit Administration has also referred to this as "Directional Route Miles (DRM)". [6] Where a network is made up of railways, route length has also been defined, by at least one source, as the sum of the distances (in kilometres) between the midpoints of all stations on the network. [7]

In a measurement of route length, each route is counted only once, [5] regardless of how many lines pass over it, and regardless of whether it is single track or multi track, single carriageway or dual carriageway. [6]

If a transport network is made up of tangible routes owned or operated by the operator of the network (such as railways), then its route length is therefore the total length of the network's revenue earning fixed infrastructure.

Line length

In scheduled transport  [ de ], a calculation may also be made of network's line length, which is the sum of the lengths of all of the lines in the network. Any route in the network that is shared by multiple lines is therefore counted more than once. As a result, the line length of a transport network is always greater than or equal to its route length.

Track length

If a network is made up of railways, tramways, or a combination of the two, its track length may also be calculated. The track length of a rail network is the combined length of all tracks in the network. Thus, a double track route will have a track length twice as long as its route length. [7]

Calculation example

Map of example network. Network length example map.svg
Map of example network.

To illustrate how the three different calculations of network length are performed, here is a simple example:

The route length is:

   5 km (A → B)   +  5 km (B → C) +  5 km (B → D) -------   15 km

The line length is:

  10 km (A → B → C, line 1)   + 10 km (A → B → D, line 2)   -------   20 km

The track length is:

  10 km (A → B, double track)   + 10 km (B → C, double track) + 10 km (B → D, double track) +  1 km (non-passenger carrying) -------   31 km

See also

Related Research Articles

Tram Street-running light railcar

A tram is a rail vehicle that travels on tramway tracks on public urban streets; some include segments on segregated right-of-way. The tramlines or networks operated as public transport are called tramways or simply trams/streetcars. Many recently built tramways use the contemporary term light rail. The vehicles are called streetcars or trolleys in North America and trams or tramcars elsewhere. The first two terms are often used interchangeably in the United States, with trolley being the preferred term in the eastern US and streetcar in the western US. Streetcar or tramway are preferred in Canada. In parts of the United States, internally powered buses made to resemble a streetcar are often referred to as "trolleys". To avoid further confusion with trolley buses, the American Public Transportation Association (APTA) refers to them as "trolley-replica buses". In the United States, the term tram has sometimes been used for rubber-tired trackless trains, which are unrelated to other kinds of trams.

Light rail Form of passenger urban rail transit

Light rail transit (LRT) is a form of passenger urban rail transit characterized by a combination of tram and rapid transit features. While its rolling stock is more similar to a traditional tram, it operates at a higher capacity and speed, and often on an exclusive right-of-way. In many cities, light rail transit systems more closely resemble, and are therefore indistinguishable from, traditional underground or at-grade subways and heavy-rail metros.

Transport in Algeria

As the tenth-largest country in the world, and the largest in Africa and in the Mediterranean region, Algeria has a vast transportation system that includes an large and diverse transportation infrastructure.

Conservation and restoration of rail vehicles Aims to preserve historic rail vehicles

Conservation and restoration of rail vehicles aims to preserve historic rail vehicles.

Median strip Reserved area that separates opposing lanes of traffic on divided roadways

The median strip or central reservation is the reserved area that separates opposing lanes of traffic on divided roadways such as divided highways, dual carriageways, freeways, and motorways. The term also applies to divided roadways other than highways, including some major streets in urban or suburban areas. The reserved area may simply be paved, but commonly it is adapted to other functions; for example, it may accommodate decorative landscaping, trees, a median barrier, or railway, rapid transit, light rail, or streetcar lines.

Guided bus Bus that is capable of running in a guideway or upon rail tracks

Guided buses are buses capable of being steered by external means, usually on a dedicated track or roll way that excludes other traffic, permitting the maintenance of schedules even during rush hours. Unlike trolleybuses or rubber-tired trams, for part of their routes guided buses are able to share road space with general traffic along conventional roads, or with conventional buses on standard bus lanes.

Various terms are used for passenger railway lines and equipment; the usage of these terms differs substantially between areas:

Rail transport in Singapore Overview of rail transport in Singapore

Rail transport in Singapore mainly consists of a passenger urban rail transit system spanning the entire city-state: a rapid transit system collectively known as the Mass Rapid Transit (MRT) system operated by the two biggest public transport operators SMRT Trains and SBS Transit, as well as several Light Rail Transit (LRT) rubber-tyred automated guideway transit lines also operated by both companies. In addition, local specialised light rail lines are in operation in places such as the Singapore Changi Airport and Sentosa.

Tramways in Île-de-France Tram system serving the immediate vicinity of Paris, France (the Ile-de-France region)

The Île-de-France tramways consists of a network of modern tram lines in the Île-de-France region of France. Eleven lines are currently operational, with extensions and additional lines in the planning and construction stage. Although the system mainly runs in the suburban regions of Paris, lines T3a and T3b run entirely within Paris city limits, and line T2 also does so for part of its route. While the lines operate independently of each other and are generally unconnected, some connections do exist: between lines T2 and T3a, T3a and T3b, T1 and T5, T1 and T8 and T8 and T11 Express. However, the final design of the entire planned tram network is fairly integrated.

Trams in Saint Petersburg

Trams in Saint Petersburg are a major mode of public transit in the city of Saint Petersburg, Russia. Saint Petersburg once had the second-largest tram network in the world, consisting of about 340 kilometres (210 mi) of unduplicated track in the late 1980s. However, since 1995 the tramway network has declined sharply in size as major portions of track were removed, particularly in the city centre. Saint Petersburg lost its record to Melbourne, Australia. While it still had 285 kilometres (177 mi) of length in 2002, by early 2007 the tram network's had declined to just over 220 kilometres (140 mi), and by the 2010s operated on just 205.5 kilometres (127.7 mi) of network.

Trams in Europe

Europe has an extensive number of tramway networks. Some of these networks have been upgraded to light rail standards, called Stadtbahn in Germany, premetros in Belgium, sneltram in the Netherlands, elétrico in Portugal and fast trams in some other countries.

Nantes tramway Tramway network in Nantes, France

The Nantes tramway is a tramway system operating in the city of Nantes in Pays de la Loire, France. The first tramway in Nantes opened in 1879 and closed in 1958 due to bombing damage during World War II, while the present tramway was re-introduced to the city in 1985.

Toulouse Metro Rapid-transit railway in Toulouse, France

The Toulouse Metro is a rapid transit system serving Toulouse Métropole, France. It is the only Metro system in Occitanie. The city's public transport system was initially managed by the Société d'économie mixte des voyageurs de l'agglomération toulousaine, which was a company 80% owned by local government bodies and 20% privately owned. It has been managed by Tisséo, under the authority of the Syndicat Mixte des Transports en Commun, an authority established by various local government bodies, since 2003.

Strasbourg tramway Tramway network from Strasbourg

The Strasbourg tramway, run by the CTS, is a network of six tramlines, A, B, C, D, E and F that operate in the cities of Strasbourg in Alsace, France, and Kehl in Baden-Württemberg, Germany. It is the only tram network apart from that of Basel to cross an international border. The first tramline in Strasbourg, which was originally horse-drawn, opened in 1878. After 1894, when an electric-powered tram system was introduced, a widespread network of tramways was built, including several longer-distance lines on both sides of the Rhine.

Tram and light rail transit systems

Although tram systems date to the late 19th and early 20th centuries, many old systems were closed during the mid-20th century because of the advent of automobile travel. This was especially the case in North America, but postwar reductions and shutdowns also occurred on British, French and other Western European urban rail networks. However, traditional tramway systems survived, and eventually even began to thrive from the late 20th century onward, some eventually operating as much as when they were first built over a century ago. Their numbers have been augmented by modern tramway or light rail systems in cities which had discarded this form of transport.

History of Manchester Metrolink

The history of Manchester Metrolink begins with its conception as Greater Manchester's light rail system in 1982 by the Greater Manchester Passenger Transport Executive, and spans its inauguration in 1992 and the successive phases of expansion.

The Athens Tram is the modern public tram network system serving Athens, Greece. It is owned and operated by Urban Rail Transport (STASY) S.A..

Trams in Graz Austrian tram system

The Graz tramway network is a network of tramways forming an important part of the public transport system in Graz, which is both the capital city of the federal state of Styria, Austria, and the second largest city in Austria.

Trams in Linz

Trams in Linz is a network of tramways forming the backbone of the urban public transport system in Linz, which is the capital city of the federal state of Upper Austria in Austria.

References

  1. 1 2 3 4 Nielsen, Gustav (2005). Public transport – Planning the networks. HiTrans Best practice guide 2. Stavanger, Norway: HiTrans. p. 94. ISBN   8299011132.
  2. Terzis, George; Last, Andrew (2000). Urban Interchanges - A Good Practice Guide: Final Report prepared for EC DG VII (PDF). Woking, Surrey, UK: MVA Limited.
  3. Mees, P; Stone, J; Imran, M; Nielsen, G (2010). Public transport network planning: a guide to best practice in NZ cities (PDF). Research report 396. Wellington: New Zealand Transport Agency. p. 20. ISBN   9780478352917.
  4. Dodson, Jago; Mees, Paul; Stone, John; Burke, Matthew (2011). The Principles of Public Transport Network Planning: A review of the emerging literature with select examples (PDF). Urban Research Program Issues Paper 15. Brisbane: Griffith University. p. 5. ISBN   9781921760365.
  5. 1 2 "Chapter 19: Railways". Statistical Year Book, India 2013. New Delhi: Ministry of Statistics and Programme Implementation, Government of India. 2013. paragraph 19.20. Retrieved 25 November 2013.{{cite book}}: External link in |chapter= (help)
  6. 1 2 "National Transit Database Glossary". U.S. Department of Transportation Federal Transit Administration. 18 October 2013. Archived from the original on 13 November 2013. Retrieved 30 November 2013.
  7. 1 2 Review of Developments in Transport in Asia and the Pacific 2007: Data and Trends (2nd revised ed.). Bangkok: United Nations Economic and Social Commission for Asia and the Pacific. 2008. p. 123. ISBN   9789211205343.