A helmet cam video being shared on Facebook shows the moments before a Thai motorcyclist dies on a road on Petchabun in the northeast.
The 998cc Yamaha YZF R1M reached 264 kph when he lost control on the Petchabun bypass on Sunday evening.
The remains of Surarat “Nong” Tonkao, 24, and his bike were found across a wide area.
His blood was shown on the base of a road sign.
The video entitled "A warning to those who like speed" showed Surarat lose control after racing alongside two friends.
The authorities said he had probably encountered roadworks at the brow of a hill and lost control. The road is being widened to four lanes at that point.
The accident occurred near the Night Coffee shop in Muang district after the bikers were coming home from a trip to Khao Kor.
The Yamaha he was riding sells for about Bt1.1 million.