
Driving north, especially to Chiang Mai or Chiang Rai, typically takes 9-11 hours. Finding safe "rest stops" is very important. These stops mainly fall into three types: Department of Highways rest areas (the safest), large gas stations, and tent camping or designated parking areas for sleeping.
Here is a guide listing rest stops along the route from Bangkok northwards.
If you leave Bangkok in the evening and begin to feel tired around here, it’s recommended to rest before entering the mountainous area.
This is the exact halfway point. Many choose to rest here before driving up Khun Tan mountain.
If taking the route via Nakhon Sawan - Phitsanulok - Phrae - Phayao.