It is a main transport route in the area of Bang Rak, Sathon and Yan Nawa districts.
It's an eight-lane reinforced concrete road in the form of boulevard with a width of 60 metres (200 ft), a distance of 5,115 kilometres (3,178 mi).
Starting from Surawong road in Suriyawong sub-district, Bang Rak district and heading southeast parallel to Khlong Chong Nonsi (Chong Nonsi canal), then cut with Si Lom road in the Si Lom sub-district, Bang Rak district, then cut with Sathon road in the area of Sathon district.
The road in this portion is a boundary line between Thung Maha Mek and Yan Nawa sub-districts of Sathon district.
Its name in honour of Princess Galyani Vadhana, Princess of Naradhiwas who was the elder sister of King Ananda Mahidol (Rama VIII) and King Bhumibol Adulyadej (Rama IX).