High Quality Content by WIKIPEDIA articles! A midibus is a classification of single-decker minibuses which generally are larger than a traditional minibus but smaller than a full-size single decker and can be anywhere between 8 metres (26 ft 3 in) and 11 metres (36 ft 1 in) long. While used in many parts of the world, the midibus is perhaps most common in the United Kingdom, where operators have found them more economical, and to have a sufficient number of seats compared to full size single-decker buses.