The Postal Service enhanced transportation. The old Method of transportation was walking which took 90 days to travel from Susa to Sardis. After the Postal service was made it only took 5 to 9 days to travel from Susa to Sardis. The Royal Road was the backbone of the Postal service. It provided a large amount of transportation to take place on the road. Rest stations were a place that was located a day from each other. The stations helped the horsemen recover and get rest and food for the next day. They rested at night due to the lack of visibility which caused them not to go at full speed on their courier (Thomson).

Communication was a major part of the postal service for helping it function. The service let the Persian military communicate better than before. It also let them react to messages faster for war related concepts. The king and other high level officials could use the postal service. Communication by the service led to the distribution of taxes along other vast empires.  Other civilizations grew as the Persians communicated with them and shared ideas. Trade was made more efficient with other civilizations. Messages after the Postal service was invented got around faster within the Empire (Majlesi).

The Persians set out on their couriers and would stop at rest stations that are roughly a day apart. As the person gets back from delivering, another person is ready to go. Rest stations were filled with food and fresh horses to continue the journey. The Postal service was a building block for other systems like the Romans.