Editing Bus (section)

==Design==
===Accessibility===
[[File:Wheelchair lift in a 1992 Flxible Metro bus lowered to sidewalk.jpg|thumb|Portland, Oregon [[TriMet]] high-floor bus with [[wheelchair lift]] extended and lowered to the sidewalk/pavement (2010)]]

During most of the 20th century, [[transit bus]]es were almost exclusively [[high-floor]] vehicles, and they used [[wheelchair lift]]s if they provided accessibility at all. (In the U.S., only in 1993 did accessibility become a requirement in all new buses, under the federal [[Americans with Disabilities Act of 1990]].)<ref name="getting on board">{{cite magazine |title=Getting on board |date=July–August 1993 |magazine=Trolleybus Magazine |number=190 |pages=86–87 |publisher=National Trolleybus Association |location=UK |issn=0266-7452}}</ref> However, they are now increasingly of [[low-floor bus|low-floor]] design and optionally also 'kneel' [[air suspension]] and have ramps to provide access for [[wheelchair]] users and people with [[baby transport|baby carriages]], sometimes as electrically or hydraulically extended under-floor constructs for level access. Prior to more general use of such technology, these wheelchair users could only use specialist [[paratransit|para-transit]] mobility buses.

Accessible vehicles also have wider entrances and interior gangways and space for wheelchairs. Interior fittings and [[rollsign|destination displays]] may also be designed to be usable by the [[visually impaired]]. Coaches generally still use wheelchair lifts instead of low-floor designs. In some countries, vehicles are required to have these features by [[Disability discrimination act|disability discrimination laws]].

===Configuration===
Buses were initially configured with an engine in the front and an entrance at the rear. With the transition to one-person operation, many manufacturers moved to mid- or rear-engined designs, with a single door at the front or multiple doors. The move to the low-floor design has all but eliminated the mid-engined design, although some coaches still have mid-mounted engines. Front-engined buses still persist for niche markets such as American school buses, some minibuses, and buses in less developed countries, which may be derived from truck chassis, rather than purpose-built bus designs. Most buses have two [[axles]], while articulated buses have three.{{citation needed|date=July 2021|reason=I haven't seen a modern bus with two axles in years.}}

===Guidance===
[[Guided bus]]es are fitted with technology to allow them to run in designated guideways, allowing the controlled alignment at bus stops and less space taken up by guided lanes than conventional roads or [[bus lane]]s. Guidance can be mechanical, optical, or electromagnetic. <!-- explain abbr. Guidance is often, but not exclusively, employed as part of a BRT scheme. --> Extensions of the guided technology include the [[Bombardier Guided Light Transit|Guided Light Transit]] and [[Translohr]] systems, although these are more often termed 'rubber-tyred trams' as they have limited or no mobility away from their guideways.

===Liveries===
[[Transit bus]]es are normally painted to identify the operator or a route, function, or to demarcate low-cost or premium service buses. Liveries may be painted onto the vehicle, applied using adhesive [[vinyl (fabric)|vinyl]] technologies, or using [[decal]]s. Vehicles often also carry [[bus advertising]] or part or all of their visible surfaces (as [[mobile billboard]]). [[Campaign bus]]es may be decorated with key campaign messages; these can be to promote an event or initiative.

===Propulsion===
The most common power source since the 1920s has been the [[diesel engine]]. Early buses, known as trolleybuses, were powered by electricity supplied from [[overhead lines]]. Nowadays, electric buses often carry their own battery, which is sometimes [[Phileas (public transport)|recharged on stops/stations]] to keep the size of the battery small/lightweight. Currently, interest exists in [[hybrid electric bus]]es, [[fuel cell bus]]es, [[electric bus]]es, and ones powered by [[compressed natural gas]] or [[biodiesel]]. [[Gyrobus]]es, which are powered by the momentum stored by a [[flywheel]], were tried in the 1940s.

===Dimensions===
United Kingdom and European Union:

: Maximum Length: Single rear axle {{convert|13.5|m|ftin|sp=us|frac=8}}. Twin rear axle {{convert|15|m|ftin|sp=us|frac=8}}.
: Maximum Width: {{convert|2.55|m|ftin|sp=us|frac=8}}

United States, Canada and Mexico:

: Maximum Length: None
: Maximum Width: {{convert|2.6|m|ftin|sp=us|frac=8}}