Every year there are in excess of 300 deaths and hundreds of injuries over the Songkran holiday period.
Last year and the year before, the worst province was Chiang Rai. This year, surprisingly, it wasn't. I only have statistics for the worst 2 provinces, but Chiang Rai wasn't one of them. It makes a nice change.
Most accidents occur between 4pm and 8pm, around 90% involve alcohol and about 80% involve motorcycles.
It pays to always expect the worst on the roads in Thailand but especially on any public holiday after lunchtime when there is a significant chance of inebriated drivers.
I also read somewhere this week, that Thailand ranks as the fourth largest consumer of alcohol per head in Asia.
It's been a fairly crazy week this week, we're seeing tourism up significantly compared with January over this holiday period.