 According to tradition, all bridges over the Chao Phraya in Bangkok are named after a member of the royal family.In October 2009, it was announced that both bridges would be named after King Bhumibol Adulyadej, with the northern bridge officially named "Bhumibol 1 Bridge" and the southern bridge "Bhumibol 2 Bridge".The unofficial name "Mega Bridge" was also widely used.