During the Pax Mongolica the Mongols revitalized the Silk Road network by protecting merchant caravans, standardizing taxes and tolls in many regions, and issuing official passports known as paiza. These measures made it easier and safer for merchants to travel across much of Eurasia. The Mongols also expanded the yam, an extensive network of postal relay stations that improved communication, administration, and long-distance travel across the empire.
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