Thanks Willi. I did ask the original mapper. No, the 4046 is not an error, it has been reported as renumbered here: http://www.captainslash.com/cnx-1150-118-cnx/

I have travelled the same section myself about 2 years ago and recorded it as 1323.

I have found roads with numbers 4xxx all over Thailand, although they are certainly not national highways. I think we are talking about two different things here… I can only speculate, but perhaps the road has been demoted to local status, so the national govt. doesn’t need to pay for it any more.

From what you are saying, then, the section of road W of the marked junction doesn’t have a number, which checks with the ESRI GPS map. If you confirm this then the number needs to be removed and the road possibly be demoted to unclassified.

Incidentally, I have started to read “Captain Slash’s” reports and are downloading his tracks. Some are already in OSM. However, the next 2-3 months I will be more or less stuck at my in-laws’ place near Suphanburi, without phone or internet (bar mobile phone connection…), so I’m not sure whether I’ll be able to do much.

Kind regards,
Peter.