these are the symbols can be use in drawing to show detail work.
Drawing labels, details, and other text information extracted from the CAD file (Translated from French):
passage, give, stop, toll, stop, zone, attention to fire, sos, products, regional, works, customs, zoll, gendarmerie, police, forbidden to herds, vehicles, slow, give way, mfa, mfb, mfc , mfd, panel, mfe, wxw, flashing