A low-floor bus is a bus that has no steps between one or more entrances and part or all of the passenger cabin. Being low floor improves the accessibility of the bus for the public, particularly the elderly or infirm, or those with push chairs, and increasingly, those in wheelchairs.
In the modern context, "low floor bus" refers to a bus that is accessible from a certain minimum height of step from ground level, to distinguish it from some historical bus designs that did feature a level interior floor throughout but with a relatively high floor height.
Many low-floor buses are low-floor over only a part of the bus, with the rear section raised to accommodate powertrain equipment. Van Hool has a series of "side-engine rear-drive" buses that puts the engine off to one side of the cabin longitudinally, to maximize usable cabin space. The Czech Irisbus Citelis - also in Skoda 24Tr trolleybus version - has 100% low floor with the engine in a vertical cabinet at the rear of the bus.
Most bus manufacturers achieve a low floor height by making rear-engined rear-wheel drive buses with independent front wheels, so that no axle is needed to pass under the floor of the passenger compartment.
For smaller buses, such as midibuses, the low-floor capability is achieved by placing the front wheels ahead of the entrance. One of the last types of buses to gain low-floor accessibility as standard was the minibus, where a similar front-wheel arrangement allows around 12 seats and a wheelchair space to be accommodated in very small low-floor minibuses, such as the Optare Alero and Hino Poncho.
Accessibility was previously achieved in paratransit type applications, which use small vehicles with the fitment of special lifts. The inception of small low-floor buses has allowed the development of several accessible demand-responsive transport schemes using standard 'off-the-shelf' buses.
Low-floor buses usually include an area without seating (or seating that folds up) next to at least one of the doors, where wheelchairs and perambulators can be parked. This is sometimes not the only purpose of this area, though, as many operators employ larger standee areas for high occupancy at peak times. Despite the space existing, operators may also insist that only one or two wheelchairs or pushchairs can be accommodated unfolded, due to space/safety concerns.
An interesting implementation of the low floor design exists in Australia, where Custom Coaches makes a "Hybrid" variant of its CB60 bodywork. These buses combine a smaller low floor area with a small underfloor bin for some luggage. Whilst these buses do not provide a full amount of luggage space, they can be used to house more luggage than what can be held inside the bus itself. Another drawback is the arrangement means the section of the bus that is at kerb height is very short-consisting of enough space to house the wheelchair area and then rising up, to accommodate the luggage bin. These buses also lack the ability to have a centre door.
A disadvantage of the low floor is accommodating the bus's own wheels. With the low floor, the wheels protrude into the passenger cabin, and need to be contained in wheel pockets of waist height, and this occupies space which would otherwise be used for seating. Seating layout for a low-floor bus therefore requires careful design.
Low floors can be complemented by a hydraulic or pneumatic 'kneeling device', which can be used when the bus is not in motion, tilting it or lowering it at the front axle even further, often down to normal kerb height. Though such technology has been available and in use on high-floor buses since the 1970s, it is of significant utility on low-floor vehicles only where it enables less-mobile passengers to board and leave the vehicle without help from others. Many vehicles are also equipped with wheel-chair lifts, or ramps which, when combined with a low floor, can provide a nearly level entry.
Many bus rapid transit systems employ a level boarding by using high-floor buses stopping at "station" style bus stops. Specially raised sections of kerb may also be used to achieve accessibility with lesser low floor models, although this is more expensive for the operator, and only attractive for regular busy scheduled routes. For infrequent routes or routes with hail and ride sections, or demand responsive transport, raised kerbs would only be feasible in terminuses.
Some transit agencies refused to order low-floor buses altogether, such as New Jersey Transit and MUNI owing to terrain conditions in the service area, or MTA Long Island Bus. DART still has a preference for high floor buses. Although New York City Transit runs some 40 foot low-floors, it originally refused to order low-floor buses, namely D60LFs from New Flyer, after the D60HF, a high floor model, was discontinued mid-delivery. However, they have demonstrated both the D60LF and NovaBus LFSA, the latter of which they have decided to order.
In the United Kingdom, because of the colloquialism of "buggy" for push chairs, low floor buses are often called buggy buses.
The Dennis Dart SLF (Super Low Floor) marked the wholesale introduction of single-deck low floor buses in the United Kingdom in 1995, after many small scale demonstrator usages. Low floor buses were rapidly introduced on high profile routes, notably becoming a requirement for London Buses contracts. The Optare Solo introduced in 1997 marked another step change with inroads into smaller usages traditionally served by minibuses. The final phase came with low floor double-deckers the Dennis Trident 2 and Volvo B7TL entering the mass market, even though they were introduced after the Optare Spectra.
Due to the deregulated nature of the public transport system in the UK, adoption of the higher cost low floor buses was usually in conjunction with some sort of grant or quality partnership with a local authority, as the profitability of many routes was not high enough to justify conversion based purely on increased revenue. It has been reported however that adoption of so called Easy Access buses does have a positive effect of ridership and revenue levels.
Under the Transport Act 1985 the Disabled Persons Transport Advisory Committee (DPTAC) (or commonly DiPTAC) was established to provide independent consultation on accessibility issues. In the same year, the first low floor bus specification was drafted by DPTAC. The Disability Discrimination Act 1995 provided for the completion of the Public Service Vehicles Accessibility Regulations 2000, which specified that all new public service vehicles over 22 seats should be low floor from 31 December 2000, with smaller vehicles mandated from 1 January 2005. The 2000 regulations do not require retro-fitting of pre-existing vehicles or the enforced sale of non compliant existing vehicles, allowing operators to retain a high floor vehicle until "the end of their economic life". In reality, as the prevalence of low floor buses spreads, combined with grants/incentives, it is likely that the prevalence of high floor vehicles in the national fleet will markedly reduce before many of the last high floor buses reach their feasible end of life, of a 2000 registered bus. In the past, in times of reduced economic investment, it was not uncommon for service buses to be used for 15 to 20 years.
While some coaches have been produced with a small front low floor section at the driver's level, most coaches in the UK are being made accessible through the use of wheelchair lifts, with the 2005 Caetano Levante being one of the largest introductions.
While another widely stated benefit of low floor buses is quicker boarding for able-bodied passengers due to the lack of steps, studies have found the opposite effect in the UK. This is apparently due to the prevailing system of operation where passengers enter and exit through one single front door. It has been suggested that the previous 1980s/90s high floor step entrance buses which featured a centre rail, encouraged a bi-directional flow of entering and exiting passengers simultaneously. The removal of the pole to allow wheelchair/buggy access created the situation where the quintessentially polite British bus passenger would wait for all passengers to alight before boarding, leading to an increase in dwell times.
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- Light blue buses: The new ordinary bus under the JnNURM scheme with low floors and LED boards. They also have an LED board inside the bus which displays the next stop the bus is approaching.
- Marcopolo Non-AC: These buses are also introduced under the JnNURM scheme. They also have low floors. They have LED boards both for displaying route number/route and the approaching stop.
- Marcopolo AC: Buses from Tata-Marcopolo collaboration introduced under the JnNURM scheme. Their fare is costilier by Rs. 2 as compared to ordinary buses. Usually ply on routes where volvo is not popular.
- Vajra: Hi-tech buses from Volvo running on routes serving the IT companies' locations and various residential routes as well. Higher fares about 1.5 to 3 times that of ordinary depending on the route. LED boards.
With the introduction of Bus Rapid Transit (BRT) and the development of dedicated corridors for the service, bus service is set to improve. The Delhi Transport Corporation (DTC) has started introducing air-conditioned buses and brand new low-floor buses (with floor height of 400 mm (15.75 in) and even higher on one third area as against 230 mm (9.06 in) available internationally) on city streets to replace the conventional buses. A revamp plan is underway to improve bus-shelters in the city and to integrate GPS systems in DTC buses and bus stops so as to provide reliable information about bus arrivals. The Delhi Government decided to expedite this process and procured 6,600 low floor buses for the DTC before commonwealth games in 2010.
In Sydney, routes may be operated by both high-floor buses and low-floor ones. Selected routes can be set aside specifically for low-floor buses which are considered to be wheelchair-accessible routes. A recent all low-floor bus network is the Metrobus system.
In Japan,a low-floor bus is called "non-step bus(ノンステップバス)".
Mitsubishi Fuso used to calling a low-floor bus "no-step bus(ノーステップバス)"
At Enshu Railway Company in Hamamatsu Area , a low-floor bus is called "omnibus(オムニバス)", "cho-teisho bus(超低床バス;very low-floor bus)" and "cho-teisho omnibus(超低床オムニバス;very low-floor omnibus)".
Japanese government calls a low-floor bus "cho-teisho non-step bus(超低床ノンステップバス;very low-floor non-step bus)".
List of low-floor buses
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- Airport Tarmac Coach
- Auto Rad Controlle (merged with Ikarus)
- DAB 1200C
- Dallas Smith Corp. - Friendly Bus Ford F-550 LF Shuttle Paratransit Bus
- Dennis Specialist Vehicles/TransBus/Alexander Dennis
- EBL Plasma
- "Advantage" Low Floor
- Hybrid Low Floor
- "Extreme" BRT
- Hankuk Fiber
- GX117 (midibus)/GX217/GX317 (standard buses)/GX417 (articulated bus)
- GX127 (midibus)/GX327 (standard bus)/GX427 (articulated bus)
- Hungarobusz H63/H63S
- Hyundai Motors
- New Aero City low-floor
- Super New Aero City low-floor
- 290 (airport bus)
- 411, 412, 417
- 481, 489
- E91, E94, E94F, E99
- E127 (rebranded from Auto Rad Controlle ARC127)
- V134 (rebranded from ARC134)
- V187 (successor of ARC187.02)
- M125M VECTO
- M121I (60% low floor)
- M181M/1 TANTUS (articulated 60% low floor)
- Credo BN 12 (60% low floor)
- Credo BN 18 (80% low floor)
- Credo Citadell 12
- Credo Citadell 19
- Credo EN 12 (60% low floor)
- 103, 107
- Millennium Transit Services RTS Extreme
- N814 (the first low-floor bus, 1976), N816
- N40xx series (N4007/4009/4010/4011/4013/4014/4015/4016/4018/4020/4021/4024/4026/4032)
- Transliner N316NF/N316LNF/N318NF/N318LNF
- D30LF (diesel) / DE30LF (diesel-electric hybrid) / C30LF (CNG) / L30LF (LNG)
- D35LF / DE35LF / C35LF / L35LF
- D40LF / DE40LF / C40LF / L40LF / GE40LF (gasoline-electric hybrid) / DE40LF BRT (bus rapid transit)
- D60LF / DE60LF / DE60LF BRT
- D40i / DE40i Invero
- 60-LFW / 60-BRT (bus rapid transit)
- Orion II
- Orion VI
- Orion VII
- S215NC, S217NC
- S315NF, S319NF
- S415NF (not yet in service)
- Urbino 10/12/15/18
- Solbus SN11M
- NB 12 CITY
- NB18 CITY
- Tata Marcopolo
- Tata Starbus
- CR221L, CR221LD, CR223LD, CR228L (body)
- 17-260 EOT Low Entry
- Accessible vehicle
- Low-floor tram
- Schaller, Bruce; Dana Lowell, Kenneth R. Stuart (May/June 1998). "MTA New York City Transit Research Shows What Customers Want in Low Floor Buses". Schaller Consulting. Retrieved on 2009-04-29.
- UK government
- Transport for you
- Agency (2010-01-20). "Next BRT corridor in East Delhi: Dikshita", The Indian Express. Retrieved on 2011-02-26.
- Bhatnagar, Gaurav Vivek (2007-09-25). "First new low-floor bus for DTC arrives", The Hindu. Retrieved on 2011-02-26.