How did improved transportation technologies and commercial practices lead to trade in the post classical era?

By increasing volume of trade and also increasing the geographical range of preexisting and newly active trade networks.

Explanation:

Improvement in transportation technologies in post classical era led to an increase in the amount of goods and people that could be ferried along trade route. It also facilitated the discovery and usage of new trade routes which would otherwise not be passable due to previous transportation technologies. Improvement in commercial practices like adoption of new languages and an agreement of payment modes also made trading with other people possible.

some of these post classical era trade routes that shaped transportation technology and commercial practices improvement includes the silk trade route in the Asia, the trans Saharan trade route in Africa and the Indian ocean trade route among others.