What was the function of triumphal arches in ancient rome

Triumphal arches in Ancient Rome were a symbol of victorious generals or  public events including the construction of a road or bridge, the accession of a new emperor, and the founding of new colonies.

Explanation:

Triumphal arches in Ancient Rome built to demonstrate the honor of an influential person or to celebrate a significant event. Arches were built-in street or a roadway where people can pass through it. The triumphal arches joined by a round arch and a square entablature in a free-standing structure. Some of the triumphal arches are Arch of Constantine, Arch of Caracalla, Arch of Titus, Triumphal Arch of Orange, etc.