Why did merchants usually not travel the entire Silk Road route?

Merchants typically did not travel the entire length of the Silk Road because it was a vast, 4,000-mile (6,400-km) network of caravan tracks rather than a single, continuous road. Instead, goods were transported in a staggered progression by various middlemen who handled specific segments of the journey.1

This relay system was practical given the immense distance and the logistical challenges of traversing diverse and often hostile terrains, such as the Takla Makan Desert and the Pamirs mountains. By operating in stages, merchants could rely on local knowledge, manage resources like water and pasture more effectively, and utilize caravansaries for protection and rest along established regional routes. Consequently, very few individuals ever completed the full trek from China to the Mediterranean.12