Freeways & Highways
Freeways:(Lock at L4)
- Principal/National Highways with 1 or 2 digits
Name them Hwy # or Hwy ## respectively.
- Motorways (with 1 digit)
Name them Hwy #
- Expressways
All expressways are toll roads and are controlled by EXAT.
Name them as they are officially named.
Major Highways (Lock at L3)
Secondary Highways in Regions with 3 digits.
Name them Hwy ###
Minor Highways (Lock at L2)
Provincial and Rural Highways/Roads with 4 digit digits.
Provincial Roads just have 4 digits, name these Hwy ####.
Rural Highways/Roads have 2 Thai characters (representing the Province) followed by 4 digits. Name these RR####
Many Highways and Motorways also have a common name associated with them. If this name appears on signage and/or is used by addresses, add the name within parentheses behind the above mentioned naming convention,
e.g. Hwy ## (Name).
Only add the street name when you are sure of the local naming. If in doubt, just use Hwy # as primary and add the name as an alternate. Local editors can update the primary name later.