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Recent Developments in Public Transportation, Topic 1 part 2
Continuing the previous post, we're looking at systems for guiding Bus Rapid Transit and similar vehicles. Today, we'll explore contact-guided systems.Snohomish Community Transit Swift bus Note the "rub-rail" on the lower yellow portion of the edge of the platform. Photo: L. Krieg |
Contact-guided vehicles
There are a couple of solutions for guiding a vehicle by contact.Station platform for Eugene, Oregon's EMX BRT Here, the rub-rail is clearly shown by its yellow paint Photo: L. Krieg |
Tire-guided contact is when there is a "rub-rail" on the sides of station platforms to dock the bus accurately. The "rub-rail" allows the operator to feel positive contact through the tire to the steering wheel, but holds the wheel far enough away from the platform edge to prevent damaging contact to other parts of the bus (such as bumpers, lug nuts, or skirting). This system is used, for example, by Community Transit's Swift service in Everett, Washington.
Contact guidance is only practical at very low speeds; otherwise, wear on the tires becomes expensive and even dangerous. For safe guided navigation in general, a small horizontal guide-wheel is used in contact with a curb or rail.
These wheels can also be used solely for docking - for example, in Cleveland Ohio's Health Line service. For navigation, a rail or concrete lip is installed along the side of the bus lane, as in Adelaide, South Australia's O-Bahn; and the Cambridgeshire Guided Busway in England.
A bus
on the O-Bahn Busway
route in Adelaide, Australia.
Photo: “Beneaththelandslide”
Wikimedia Commons. Reproduced under the terms of the GNU Free Documentation License
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Cambridgeshire, England Busway Concrete lip of trackway provides guidance Photo: Bob Castle
Wikimedia Commons. Reproduced under the terms of the GNU Free Documentation License
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To learn more:
- Wheel-guided: Adelaide O-Bahn
- Wheel-guided: Cambridgeshire Busway
- Rub-rail: Snohomish County Swift
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