The Bangkok-bound tour bus, carrying 36 retirees of a telecom company returning from holiday along with the bus driver and a bus assistant, was travelling from Phrae when it ran off the winding downhill road and fell into the deep ravine at tambon Ban.
The bus, operated by state-run Transport Company, was hired to take the 36 retirees on a holiday in the northern province of Uttradit.
The driver, who was apparently not familiar with the road, is believed to have jumped from the bus before it plunged off the road into the ravine, police said.
According to the World Health Organization's 2015 report, Thailand has the world's second most dangerous roads in terms of per capita deaths, second only to Libya.
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