Sometimes I don’t feel like mapping and just browsing around the wiki and I found a wikipage with a nice source:
source mentioned: http://aprdc.ap.gov.in/Documents/DOWNLOADDOCUMENTS/STATE%20SH%20ROADS.pdf
Am I right, that these mentioned routes are all SH? I started to add some relations to OSM. Before I proceed to extract more data from the file I wanted to be sure.
In the document no numbers are mentioned, so I just put ref:SH# in the relation.
In the document you mentioned there are no ref-numbers for the roads.
Wikipedia has a list of SHs. But it is not allowed to copy these informations (See : https://wiki.openstreetmap.org/wiki/Collaboration_with_Wikipedia)).
And wikipedia does not have usefull source references.
I looked around in the web and there are no government sites to use. If yes then you read “under construction”.
So the situation is quite desperate in Andhra Pradesh.