Hello ferog_v, thank you for responding. I am not certain whether the traffic rules for trunk roads apply to towns of modest population or just large cities. This is something that I think would be best discussed with the community as a whole on the Mexico telegram page. Doing this will open the conversation for the entire community to determine how best to follow Mexico's editing guidelines and which resources are acceptable for making these changes.
Would you be willing to post this on the Mexico telegram page (https://t.me/osm_mx) to further discuss classification updates in the vicinity of Mérida, Yucatán? If you have more questions feel free to reach out to our community lead, Teddy, at tahlvin@apple.com.  
Have a nice day!