Final answer:
The Royal Road was an ancient highway that connected different parts of the Persian Empire, enabling communication, trade, and transportation.
Step-by-step explanation:
The Royal Road was an ancient highway that connected different parts of the Persian Empire. It stretched from the city of Susa in the east to Sardis in the west, covering a distance of over 1,500 miles. This road allowed for easier communication, trade, and transportation of goods and people across the empire.