In 1996 the DIN German Institute for Standardization issued the DIN 18024 part 1 ("Barrierefreies Bauen - Teil 1: Straßen, Plätze, Wege, öffentliche Verkehrs- und Grünanlagen sowie Spielplätze; Planungsgrundlagen" / Barrier-Free Design - Part 1: Streets, Places, Roads and Recreational Areas; Planning Basics), updated in 1998. Kassel had been at the forefront, performing tests with low-floor buses as early as 1992. A simple increment on the bus platform height showed problems with wear on the bus tyres, and the planning department of the Kassel public transport company began to assemble ideas on a "special curb" ("Sonderbord") for their bus stops in 1994. A manufacturer was found in Fröhlich Bau AG in Gesungen south of Kassel with their patent kerb (EP0544202/1993). After its termination manufacturing was taken over by Profilbeton GmbH in Borken, Hesse (also south of Kassel). By 2001 about 16% of bus stops in Kassel had been converted to "Kasseler Sonderbord".
The kerb guides the tyre of the stopping bus, improving the alignment of the doors with the kerb and slightly raised boarding platform. As the tyre rides up the concave surface, gravity pulls it back down and steers the bus into alignment.
The kerb has become a common part of contemporary bus stop design - the provisions of DIN 18024-1 were proposed in 2010 to become a section of DIN 18070 („Öffentlicher Verkehrs- und Freiraum“ / Public Transport and Open Spaces).
The "Dresdner Combibord" kerb is a parallel development, derived from the elevated sidewalks used for low-floor trams in Dresden, Germany. Its development started during the introduction of the first low-floor trams (mode Gelenktriebwagen NGT6DD during 1995-1998) and the Combibord patent was granted in July 1997 (DE 19730055). The round section allows busses to align to the tram platform in a similar way as the trams for level entry.
The Dresden public transport company gives the following reference data:
- minimum platform height at tram door: 230 mm
- minimum platform height at bus door: 180 mm
- maximum remaining entry height from platform to tram: 50 mm
- maximum remaining entry height from platform to bus: 80 mm
- maximum remaining gap between platform and tram/bus: 50 mm
- on dedicated tram stop platforms an accessibility from public sidewalks is asserted with a maximum ramp elevation of 30 mm and incline below 6%
- The Erfurt Busbord kerb deployed since 2007 has a height of 240 mm. (the kerb in Kassel has been 18 cm).
- The Berlin Combibord kerb is 210 mm above rail (the kerb in Dresden is 240 mm above rail).
|Wikimedia Commons has media related to Kassel kerbs.|
- "Bus Stop Innovation: A Comparison of UK Trials". The Centre for Independent Transport Research in London. Retrieved May 9, 2006.
- "Kasseler Verkehrs-Gesellschaft AG: Historie". Retrieved 2012-12-02.
- "EP0544202: Kerbstone and stop for buses and the like, especially for combined tramway and bus traffic". European Patent Office.
- Dipl.-oec. Jürgen Burmeister (2001). "Einfach einsteigen". NahverkehrsPraxis. Retrieved 2012-12-02.
- "Begrenzung einer Fahrbahn für Busse und Schienenfahrzeuge an kombinierten Haltestellen". European Patent based on DE 19730055 (in German). European Patent Office. 1998-07-10. "Priorität: 14.07.1997 DE 19730055"
- "Barrierefrei durch Dresden". DVB Fakt. Dresdner Verkehrsbetriebe. p. 4. Retrieved 2012-12-02.
- "Weitere niederflurgerechte Bushaltestellen". Pressemitteilung. Erfurt Tiefbau- und Verkehrsamt. 2007-10-02. Retrieved 2012-12-02.
- "Berliner Combiborde 21". Railbeton. Retrieved 2012-12-02.