Let the traveler beware. This phrase has been used as a concise expression of the duty of a traveler on the highway to use due care to detect and avoid CAVEATOR 180 CENSARII defects In the way. Cornwell v. Com’rs, 10 Exch. 771, 774. CAVEATOR. One who files a caveat. Cavendnm est a fragmentis. Beware of fragments. Bac. Aph. 20.