What are interchanges?

Answer 1

inter change able parts are those whos parts can be changed.

Answer 2

Interchanges are a means of connecting two or more roads. Interchanges require at least oneoverpass, which allows trough traffic to flow on both roads without stopping. The two roads are connected by one or more ramps. Interchanges increase traffic flow and capacity, and operate better than a standard at-grade intersection.

Interchanges can rance from simple such as a diamond interchange, which is simply 4 ramps, to intermediate such as the famous cloverleaf, to advanced such as the 4-level stack interchange.

Interchanges are denoted by exit signs typically.