From Longman Dictionary of Contemporary Englishcattle gridˈcattle grid British English, cattle guard American English noun [countable] TTRa set of bars placed over a hole in the road, so that animals cannot go across but cars can
Examples from the Corpus
cattle grid• A large iron gateway sagged permanently open, beside a lodge house and a cattle grid.• Go on to Trecadifor Farm and over a cattle grid.• Hicks swung it open and they went carefully over an iron cattle grid and followed the trail downward. 