There must be quiet and pleasurable roads somewhere in Thailand, but most are a nightmare of multiple speed vehicles, slow in fast lane, fast in the slowest lane, motorbikes buzzing, huge trucks thundering, and virtually all vehicles driving in two lanes at once. There are few cows in the streets, but the congestion is way beyond even Delhi, no kidding, in Bangkok.
If you can enjoy driving in Thailand, you have moved your astral plane or something because you are not of the ordinary world. It is that bad.
a driver in Thailand