Hello, Cyrille 37;
Based on this updated document highway schedule Special for the Moroccan date "16 January 2025"
roads "http://www.sgg.gov.ma/BO/AR/3111/2025/BO_7370_Ar.pdf"
Starting from page number "241" to "261"
Explains that still put R on the ref tag so the letter "ط" in the document means "طريق" in English "road", the abbreviation is "R"
Also, I think the ref tag shouldn't differ between the relations and the roads.
Regards,
Aya Samir