Kowloon Motor Bus launches open-top double-deckers on its sightseeing route HK1 tomorrow (Sunday, 3rd). Four Alexander Dennis Enviro500s have been converted to open top and these carry four different liveries, reflecting the changes in the exterior design of KMB’s fleet – the retired “hot dog” and red and white buses introduced in the 1980s, the golden design launched in 1997, and the latest red livery introduced in 2017.