Driver Nuttawut Ketkeaw, 34, screamed as dashcam footage caught the German’s death.
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It shows Mr Melzer speeding along the outside lane of a raised motorway before colliding with the barrier and falling over the edge. Paramedics found his body in the undergrowth below the road.
Police believe that the German expat, who had been running a tool shop in Thailand for several years, lost control of the bike because he was speeding.
Facebook posts from earlier that afternoon reveal Mr Melzer had been struggling to treat his wound as he could not afford the treatment and did not have medical insurance.
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