An articulated bus, also referred to as a Slinky bus, an artic, bendy bus, tandem bus, vestibule bus, stretch bus, or an accordion bus, is an articulated vehicle, typically a motor bus or trolleybus,
Irisbus Citelis
…three varieties: Citelis 10 and Citelis 12, which are standard buses with respectively 10 m (33 ft) and 12 m (39 ft) length, and Citelis 18, which is articulated and has a length of 18 m (59 ft). Citelis models use Euro 4, Euro 5 & EEV engines. The buses can also be built as trolleybuses, utilising overhead…
Volgren Optimus bodied Volvo B8RLEA of Transperth, Perth, Western Australia, Australia, November 2018
An articulated Wright Eclipse Fusion, bending as it drives round a corner at the University of Bath, England, May 2008