Double-decker Bus

A double-decker bus is a bus that has two storeys or decks. Double-decker buses are used for mass transit in the United Kingdom, an iconic example being the red London bus. Double-decker buses are also used in other cities in Europe, Asia, and former British colonies and protectorates such as Hong Kong, Singapore, Malaysia and Canada. Almost all double-deckers have a single, rigid chassis. These buses are commonplace in British commuter transport but open-top models are often used as sight-seeing buses in cities across the world due the top deck's vantage point. [Double-decker bus. Wikipedia]