Transportation was standardized under the Qin in several key ways. One major aspect was that roads were made the same width, which facilitated the movement of goods and troops. Additionally, carriages were standardized, with uniform heights and axles of the same length, which improved compatibility and efficiency in transport. Moreover, the implementation of a uniform road tax helped to regulate and streamline transportation costs across the empire. Therefore, the correct response could include the following points:
- Roads were the same width.
- Carriages were the same height.
- Axles of carriages were the same length.
All of these measures contributed to improved transportation efficiency across the Qin Dynasty.
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