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Vibhavadi Rangsit Road (Thai: ถนนวิภาวดีรังสิต, RTGS: Thanon Wiphawadi Rangsit) or Highway 31, often informally called Vibhavadi Road (ถนนวิภาวดี), is a highway in Thailand.
It is named in honor of HRH Princess Vibhavadi Rangsit (1920–1977), a well-known Thai novelist who dedicated the final decade of her life to developing rural Southern Thailand, and was killed in an attack by insurgents while trying to rescue injured Border Patrol police. Prior to the renaming of Highway No. 31 as Vibhavadi Rangsit Road, it was commonly known as "Superhighway Road" (Thai: ถนนซูเปอร์ไฮเวย์, Thanon Superhighway).