Double-decker bus
The first commercial horse-drawn double-decker omnibuses were introduced in England in 1847 by Adams & Co. of Fairfield, Bow, then improved upon by John Greenwood, who introduced a new double-decker in 1852.
Metro Manila Transit Corporation Double-Decker Bus
Presently, double-decker buses are used by the Mall of Asia Arena (Higher KLQ6119GSE3 B91H-series) and the Subic Bay Metropolitan Authority (King Long XMQ6110GS). Former operators were Matorco, which introduced such buses to the Philippines, and the Metro Manila Transit Corporation (Leyland Atlantean).