Certain Bridge is a term used to describe a bridge that is designed to span a certain distance. The most common type of Certain Bridge is the Easts, which is a five-letter word meaning a bridge with two supports at each end and a roadway in between. Another type of Certain Bridge is the TRESTLE, which is a seven-letter word meaning a bridge composed of a number of short spans supported by trestles. Finally, the PASS is a four-letter word meaning a bridge that allows people or vehicles to PASS over a body of water or other obstacle.