Low-floor bus in the context of "City bus"

The Volvo B5LH (initially known as the Volvo B5L Hybrid, also known as the Volvo BRLH) is a low-floor hybrid electric bus chassis for both single-decker buses and double-decker buses manufactured by Volvo since 2008. It is the basis for Volvo's integral 7700 Hybrid full low floor city bus and its successor, the 7900 Hybrid from 2011. In 2008, pre-production batches of both types of chassis were manufactured. Serial production started in June 2010. From 2013 it is also available as an articulated bus chassis.

An updated version, the Volvo B5LHC, was launched in 2016, designed for high-capacity inner-city work. The chassis was available with Wright SRM bodywork. The B5LHC was discontinued in 2018 after only two examples built, with Volvo instead focusing on developing the Volvo BZL battery electric bus chassis.

A single-decker bus or single-deck bus, is a bus that has a single deck for passengers. Normally the use of the term single-decker refers to a standard two-axled rigid bus, in direct contrast to the use of the term double-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 varying internal 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).

In regions where double-deckers are not common, the term single-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 name transit bus or related terms, which can correctly be applied to double-deckers too.

The Dennis Dart is a rear-engined single-decker midibus chassis that was introduced by Dennis of Guildford, England, in 1989, replacing the Dennis Domino. Initially built as a high-floor design, in 1996 the low-floor second generation Dennis Dart SLF was launched. In 2001, production of the Dart SLF passed to TransBus International, during which time it was sold as the TransBus Dart SLF; Alexander Dennis took over production in 2004, renaming the product as the Alexander Dennis Dart SLF.

More than 12,600 Darts were produced in total during a 19-year production run. Most were purchased by United Kingdom operators, although examples were sold in Europe, North America, Australia and Hong Kong. In the United States, the Dart SLF, with Alexander ALX200 bodywork, was built and sold by Thomas Built Buses as the Thomas SLF 200.