Tinsulanond Bridge (สะพานติณสูลานนท์) spans the Songkhla Lake and is part of Hwy 408. It is the longest concrete bridge in Thailand, with two parts: the first part connects the coast of Amphoe Mueang Songkhla at Ban Nam Krachai to the southern coast of Ko Yo, this part is about 1,140 m long; the second part connects the northern shore of Ko Yo to the coast of Ban Khao Khiao, a length of 1,800 m. It was opened to traffic on 25 September 1986.