"Thailand ended the COVID-19 lockdown on 30 September 2022." The 2021 and 2022 figures are skewed because Thailand was in lockdown during Songkran, yet still had 277 deaths in 2021. The 2023 numbers might not represent the true trend either, as it was still recovering from the lockdowns and afraid to venture out till things settled down with Covid. Thus the more accurate indication of the trend would have been in 2024 which are not showing here.
A google search revealed for 2024,"From April 11 to 17 of 2024, 480 people were killed in road accidents in Thailand during the Songkran holidays, which is higher than all the figures in this graph starting at 2014. Not a good trend as it indicates to a statistician its on its way up and significantly.
I bet my house for 1 Baht on it the politicians during this period from 2014 of the graph were making the same promises every year as they have made this year. They "Talk the talk" but do not do the " Walk the walk".