The kingdom has some of the world's most lethal roads, with accidents spiking over Songkran -- the April new year festival -- as millions of city workers return to their country homes.
Both Songkran and the western New Year are both dubbed the "seven deadly days" because of the surge in crashes and road fatalities.
Figures released today showed 390 people lost their lives on Thailand's roads during the previous seven days, an eleven percent decrease on the previous year.
But until now all the previous campaigns showed no reductions.
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Junta chief Prayut Chan-O-Cha on Tuesday said there was still work to be done to persuade Thais to drive more responsibly.
"No I am not satisfied because people are still dead," he told reporters.
Despite relatively good infrastructure, Thailand has the world's second most dangerous roads in terms of per capita deaths, according to data collected by the World Health Organization in a 2015 report.
Nearly a third of accidents over this year's Songkran -- 28 percent -- were caused by drunk driving. Military authorities said they also seized 5,600 motorbikes and 1,800 cars driven by people who were over the limit.
Experts say speeding and a lack of helmet-wearing among motorcyclists are also major factors behind the high death rate.
The kingdom's traffic cops are also notorious for bribe- taking and letting wealthy, well-connected drivers off the hook for offences.
Neighbouring Myanmar, which also celebrates the traditional new year over the same period, said 285 people were killed on its roads last week.
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