I have a question. I've noticed that you're going around adding HGV to a ton of roads around Texas, but your source isn't correct. The link that you're sourcing is merely who grants the authority for a truck route, or restrict a truck route. https://onlinemanuals.txdot.gov/TxDOTOnlineManuals/TxDOTManuals/smk/truck_routes.htm This link gives information about truck routes, and how cities can have truck routes in various parts of their limits. Do you have a better source to cite?

As far as I know, most roads within Texas are hgv, especially those in the rural farm lands as well as those along the Gulf Coast where the oil refineries are. Also, it's understood that trucks are allowed to go on any road that hasn't been signed as "no trucks allowed." 