Bus

In the past, there was no tram in Kowloon; and only rich people can transport with rickshaw. Therefore, there was not any kind of public transport for the citizens. The Kowloon Car Company then provided bus services to people between Tsim Sha Tsui and Sham Shui Po in 1921. Interestingly, the situation of buses in Hong Kong is exactly the opposite of Macao. In the past, buses of Hong Kong were firstly single-deck buses. Only in 1949 Hong Kong hanged to use double-deck. (translated by Bibiana)

Reference: LeePoSin Former Land Public Transport of Hong Kong.ppt.
Today, there are five bus companies providing their services to the people of Hong Kong. But the most commonly recognized and heard are Kowloon Motor Bus (KMB) (九巴), KCR Feeder Bus (KCR)(九鐵巴士) and Citybus (城巴) (Buses in Hong Kong).

Reference: Wikipedia Buses in Hong Kong