The department on Friday reported the road death toll at 39.
Combined accidents over the first two days reached 791, with 101 deaths and 838 injuries, according to the department.
Chiang Mai had the most road accidents at 18. Provinces with the most fatalities were Chiang Mai, Kanchanaburi, Khon Kaen, Roi-Et and Prachuap Khiri Khan, with three each.
Prachuap Khiri Khan had the most injuries at 21.
Accident-free provinces were Si Sa Ket and Trat.
The main causes of the accidents were drunk driving and speeding. Motorcycles and pickup trucks were involved in the largest number of accidents.
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