I over two years in Thailand I have only been stopped for ID once and that was when there was a quarantine/lock down in effect. This afternoon at about 17:00 I was traveling south on Sukhumvit and there was a large contingent of police. They had set up a covering large long enough that about 5 vehicles could be under it and it was 4 lanes wide. The police just asked for your drivers license, looked at it and then let you go.
Anyone's guess on this? Maybe looking to see if the drivers license showed a local address?