Wikipedia

Guided bus

(Redirected from Obahn)
Not to be confused with Road-rail bus, Railbus, or Rail replacement bus service.
"Tram bus" redirects here. For buses that look similar to trams, see Bi-articulated bus.

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 railbuses, trolleybuses or rubber-tyred 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.

A Mercedes-Benz O305 bus on the O-Bahn Busway route in Adelaide, Australia

Guidance systems can be physical, such as kerbs or guide bars, or remote, such as optical or radio guidance.

Guided buses may be Articulated bus, allowing more passengers, but not as many as light rail or trams, which are not constrained to a regulated maximum size in order to freely navigate public roads.

History

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Precursors

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The kerb-guided bus (KGB) guidance mechanism is a development of the early flangeways, pre-dating railways. The Gloucester and Cheltenham Tramroad[1] of 1809 therefore has a claim to be the earliest guided busway. There were earlier flangeways, but they did not carry passengers.[2][3]

Modern examples

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There are a few examples of guided buses around the world constructed since 1980.

The first modern guided busway system was opened in 1980 in Essen, Germany. This was initially a demonstration track, but it was periodically expanded and is still in operation as of 2019.[4]

The first guided busway in the United Kingdom was in Birmingham, the Tracline 65, 1,968 feet (600 m) long, experimentally in 1984.[5] It closed in 1987.[6]

Based on the experience in Essen, in 1986 the Government of South Australia opened the O-Bahn Busway in Adelaide.[7][8] This is a 12-kilometre guided busway.[9]

In Mannheim, Germany, from May 1992 to September 2005 a guided busway shared the tram alignment for a few hundred metres, which allowed buses to avoid a congested stretch of road where there was no space for an extra traffic lane. It was discontinued, as the majority of buses fitted with guide wheels were withdrawn for age reasons. There are no plans to convert newer buses.[10]

The Nagoya Guideway Bus opened in March 2001 and is the only guided bus line in Japan.

The Cambridgeshire Guided Busway between Cambridge and St Ives, at 25 kilometres (16 miles), is the world's longest guided busway.[11]

Between 2004 and 2008, a 1-mile (1.5 km) section of guided busway was in operation between Stenhouse and Broomhouse in the west of Edinburgh.The route was later converted for use by Edinburgh trams.[12][13]

Rubber-tyred trams

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Main article: Rubber-tyred tram
See also: Translohr and Bombardier Guided Light Transit

Guided buses are to be distinguished from rubber-tyred systems that cannot run other than along a dedicated trackway, or under fixed overhead power lines.

Guidance systems

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Optical guidance

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An optical guidance device on TEOR bus in Rouen
 
Irisbus Crealis Neo, an optically guided TEOR bus in Rouen

Optical guidance relies on the principles of image processing. A camera in the front of the vehicle scans the bands of paint on the ground representing the reference path. The signals obtained by the camera are sent to an onboard computer, which combines them with dynamic parameters of the vehicle (speed, yaw rate, wheel angle). The calculator transmits commands to the guidance motor located on the steering column of the vehicle to control its path in line with that of the reference.

Optical guidance is a means of approaching light rail performance with a fast and economical set-up. It enables buses to have precision-docking capabilities as efficient as those of light rail and reduces dwell times, making it possible to drive the vehicle to a precise point on a platform according to an accurate and reliable trajectory. The distance between the door steps and the platform is optimized not to exceed 5 centimetres (2 in). Level boarding is then possible, and there is no need to use a mobile ramp for people with mobility impairments.

The Optiguide system, an optical guidance device developed by Siemens Transportation Systems, has been in revenue service since 2001 in Rouen and Nîmes (only at stations), France, and has been fitted to trolleybuses in Castellon (Spain) since June 2008.

Another system was introduced in 2017. Called Autonomous Rail Rapid Transit (ART) and developed by CRRC, it uses optical systems to follow markers on a roadway. The ART system is frequently referred to as a "trackless tram" and occasionally as an "optically-guided bus".[14]

Magnetic guidance

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Other experimental systems have non-mechanical guidance, such as sensors or magnets buried in the roadway.[15][16] In 2004, Stagecoach Group signed a deal with Siemens to develop an optical guidance system for use in the United Kingdom.[17]

 
Phileas bus

Two bus lines in Eindhoven, Netherlands, are used by Phileas vehicles. Line 401 from Eindhoven station to Eindhoven Airport is 9 km (5.6 mi) long, consists largely of concrete bus lanes and has about 30 Phileas stop platforms. Line 402 from Eindhoven station to Veldhoven branches off from line 401 and adds another 6 km (3.7 mi) of bus lanes and about 13 stops.[18]

Some years ago, the regional authority for urban transport in the Eindhoven region (SRE) decided to discontinue the use of magnetic guidance system. In 2014 the manufacturer, APTS, was declared bankrupt.

The Douai region in France is developing a public transport network with dedicated infrastructure. The length of the lines will be 34 km (21 mi). The first stage is a line of 12 km (7.5 mi) from Douai via Guesnain to Lewarde, passing close to Waziers, Sin-le-Noble, Dechy and Lambres-lez-Douai. 39 stop platforms will be provided with an average distance between the stops of 400 m (440 yd). A number of stops will be placed on the right-hand side of each lane. Central stops between both lanes will be placed at locations with limited space at the right side. This requires vehicle to have doors on both sides.

On 3 November 2005, a licence and technology transfer agreement was signed between Advanced Public Transport Systems (APTS) and the Korea Railroad Research Institute (KRRI). KRRI was to develop the Korean version of Phileas vehicle by May 2011.[19]

Since June 2013, 3 miles (1.5 miles each way) of the Emerald Express (EmX) BRT in Eugene, Oregon, has used magnetic guidance in revenue service on an especially curvy section of the route that also entails small radius S-curves required for docking. The driver controls braking and acceleration.[20]

Kerb guidance

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Further information: Guide bar
 
Kerb-guided track and adjacent multi-user path along a disused rail line, on the Leigh-Salford-Manchester Bus Rapid Transit
 
Cross-sectional diagram of the parallel direction curbs of the bus lane in Essen, Germany

On kerb-guided buses (KGB) small guide wheels attached to the bus engage vertical kerbs on either side of the guideway. These guide wheels push the steering mechanism of the bus, keeping it centralised on the track. Away from the guideway, the bus is steered in the normal way. The start of the guideway is funnelled from a wide track to guideway width. This system permits high-speed operation on a narrow guideway and precise positioning at boarding platforms, facilitating access for the elderly and disabled. As guide wheels can be inexpensively attached to, and removed from, almost any standard model of bus, kerb guided busway systems are not tied to particular specialised vehicles or equipment suppliers. Characteristically, operators contracted to run services on kerb-guided busways will purchase or lease the vehicles, as second-hand vehicles (with guide wheels removed) have a ready resale market.

The kerb-guided system maintains a narrow track while still enabling buses to pass one another at speed. Consequently, kerb-guided track can be fitted into former double-track rail alignments without the requirement for additional land-take that might have been necessary were a disused railway to be converted into a public highway. Examples include the Cambridgeshire Guided Busway and Leigh-Salford-Manchester Bus Rapid Transit; in both schemes, it has proved possible to provide space for a wide multi-user path for leisure use alongside the kerb-guided double track, all within the boundaries of the disused railway route. Both the Cambridgeshire and Leigh-Salford-Manchester schemes have reported greatly increased levels of patronage (both on the buses themselves and the adjacent paths), high levels of modal transfer of travellers from private car use, and high levels of passenger satisfaction.[21][22]

Examples of guided busways

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See also: List of guided busways and BRT systems in the United Kingdom

Systems with conventional/modified buses:

Tram-like guided busway (rubber-tyred tram) systems include:

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See also

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References

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  1. ^ Bick, D. E. (1968). The Gloucester and Cheltenham Railway and the Leckhampton Quarry Tramroads. Oakwood Press.
  2. ^ Schofield, R. B. (2000). Benjamin Outram 1764–1805: an engineering biography. Cardiff: Merton Priory. ISBN 1-898937-42-7.
  3. ^ Wagonway Research Circle (20 May 2010). "Plateways/tramways – overview and list of some available resources". Island Publishing.
  4. ^ "Bus Priority Systems (Bus Rapid Transit) – Special Feature on Kerb Guided Buses (O-Bahn)".
  5. ^ Tracline 65 Buses issue 357 December 1984 page 538
  6. ^ Back on Track Bus & Coach Preservation December 2019 pages 12–14
  7. ^ O-Bahn is open for business Truck & Bus Transportation March 1986 pages 40–43
  8. ^ Adelaide's O-Bahn Australian Bus Panorama issue 1/5 May 1986 pages 3–8
  9. ^ The Adelaide O-Bahn Busway Australian Bus issue 32 March 2009 pages 23–27
  10. ^ Smiler, Simon (20 January 1998). "Special Feature On Kerb Guided Buses (O-Bahn)". Bus Priority Systems (Bus Rapid Transit). Retrieved 11 February 2024.
  11. ^ "Cambridgeshire guided busway opens to passengers". BBC News. 7 August 2011.
  12. ^ "£10.5m bus project comes on track". BBC News. 2 December 2004. Retrieved 21 August 2022.
  13. ^ "Edinburgh Western Corridor Busway (Fastlink)". Alan Howes Associates. Archived from the original on 30 July 2021. Retrieved 21 August 2022.
  14. ^ "Debunking the myths around the optically-guided bus (trackless trams)". The University of Sydney Business School. Retrieved 19 July 2021.
  15. ^ Simon Smiler. "New Era Hi-tech Buses". citytransport.info. Retrieved 21 May 2010.
  16. ^ "University of Berkley PATH Magnetic Guidance System – used on Snowploughs with trials including Transit Bus running and docking". Path.berkeley.edu. Archived from the original on 13 June 2010. Retrieved 21 May 2010.
  17. ^ "Stagecoach signs deal with Siemens to develop new bus optical guidance system". Stagecoach Group. 8 December 2004. Archived from the original on 10 November 2006. Retrieved 28 July 2006.
  18. ^ "APTS Phileas". Archived from the original on 11 February 2010. Retrieved 19 October 2009.
  19. ^ "Bimodal Transportation Research Center(Korea)". Bimodaltram.com. Archived from the original on 22 July 2012. Retrieved 21 May 2010.
  20. ^ Han-Shue Tan and Jihua Huang (4 June 2014). "The Design and Implementation of an Automated Bus In Revenue Service on a Bus Rapid Transit Line" (PDF).[permanent dead link‍]
  21. ^ Alan Brett (2013), Cambridgeshire Guided Busway – Usage Research, Cambridgeshire County Council, archived from the original on 23 February 2014, retrieved 16 May 2017
  22. ^ Presentation to BRT UK (PDF), Transport for Greater Manchester, 16 September 2016, retrieved 27 March 2017
  23. ^ "Cambridgeshire County Council – Guided Busway homepage". Cambridgeshire.gov.uk. Archived from the original on 16 April 2009. Retrieved 24 January 2011.
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