Double-decker bus
With the exception of coaches, double-decker buses are uncommon in the United States. Many private operators, such as Megabus, run by Coach USA, employs double-decker buses on its busier intercity routes.
Double-decker bus
Singapore Bus Service, now known as SBS Transit (SBST), was for many years the only operator of double-decker buses in Singapore, launched its first double-decker bus service on 13 June 1977 with 20 Leyland Atlanteans running on service 86 and launched by then-Deputy Prime Minister and Minister of Communications Ong Teng Cheong The fleet grew steadily, with the further introduction of the Mercedes-Benz O305 and the Leyland Olympian in 1993, the latter being the first air-conditioned double-decker bus and the longest bus to date at in length, leading to its nickname of "Superbus". The Volvo B10TL, the first stepless, ultra-low-floor "Superbus" was launched in 1999. Volvo B9TL wheelchair-accessible buses began to be introduced in 2006, by 2014, SBST had over 1631 of these buses in service.