How did the Royal Road benefit the Persians? It prevented invaders from entering the Persian Empire.
It encouraged the building of Persian naval vessels.
It established communication throughout the Persian Empire.
It helped the Persians reach Rome and then conquer it.

The Royal Road benefited the Persians by allowing for rapid communication throughout the empire. ... The road was built with such quality that much of it remained in Persia until Roman times. The road also helped Persia increase long-distance trade networks from Egypt to India.

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