The roads were invented in China during the Qin dynasty. This was an important invention of
the time period because they were built for that people could run in a straight line whenever
possible. In cough terrain, mountains were tunneled through and depressed areas were built
up with rubble. Another invention that was invented in China during the Qin dynasty is the long wall it was built with whatever materials were most readily at hand: stones and gravel were used in the muntain regions, clay in the open plains, and layers of sand,pebbles.