Two big motorcycles driven by Thanatthakorn Chareonsuk, 32, and Kritsada Wanpen, 25, collided into each other at a curve, causing one of them flip and another to explode.
Thanatthakorn was found dead in the scene, while Kritsada suffered severe injuries and a broken leg in the crash.
Police are studying CCTV footage and will question Kritsada to find the true cause of the tragedy.