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Asingle-decker bus orsingle-decker is abus that has a single deck forpassengers. Normally the use of the termsingle-decker refers to a standard two-axledrigid bus, in direct contrast to the use of the termdouble-decker bus, which is essentially a bus with two passenger decks and a staircase. These types of single-deckers may feature one or more doors, and varyinginternal combustion engine positions. The majority of single-deckers have a length of up to 12 m (39 ft 4 in), although some exceptions of longer buses exist. They also typically weigh between 11 and 14 t (12 and 15 short tons).[1][2]
In regions where double-deckers are not common, the termsingle-decker may lack common usage, as in one sense, all other main types of bus have a single deck. Also, the term may become synonymous with the nametransit bus or related terms, which can correctly be applied to double-deckers too.
With the exception of regions of major double deck orarticulated bus operation, usually majorurban areas such asHong Kong, cities inthe United Kingdom andSingapore, the single decker is the standard mode ofpublic transport bus travel, increasingly withlow floor features.
With their origins invan chassis,minibuses are not usually consideredsingle-deckers, although modern minibus designs blur this distinction.Midibuses can also be regarded as both included with and separate from standard single-deckers, in terms offull size length and vehicle weights, although again design developments have seen this distinction blurred. Somecoach style buses that do not have underfloor luggage space can also be correctly termed as single-deckers, with some sharing standard bus chassis designs, such as theVolvo B10M, with a different body style applied.